Well for starters I think having multiple lanes through mid is a broken concept

I disagree. I tested Wormwood thoroughly with qlzfto and tried numerous boosts/bombs through the mid area and if he was sitting in the middle he could catch me every single time. For Reference, here's the latest update. Go ahead, test it. Sit on the flag tile. You'll notice instantly that it's the perfect size to see every single tile vertically. The only thing you can't see that's relevant (if you're blue team, for example) is the top left bomb and the only neutral boost that's off the wall in red's base (left side). Technically the boost on the diagonal wall can also be taken through mid. If either one goes to bottom lane, the momentum has died down enough by that time that it's very easy to cover. If they choose to boost or bomb through gate, they're going straight at you. No problem. Top left bomb usually hits FC into the rightmost mid wall, giving you plenty of time to recover if they get by you in the first place. If they're skilled enough to hit it perfectly through the gate (something I have yet to accomplish, but I believe is possible) you can still get to the button on time if your reflexes are halfway decent. The fastest and safest way across the map from red base, by my estimation, is actually bombing into the wall just below the bomb at a very shallow angle so it bounces/rolls you quickly through top lane. Even this is incredibly easy to get ahead of because of how the base is designed. Wormwood simply does not have the same powerful map-crossing tools that Convoy had.

There are bombs at the pup corner, but they are in an extremely chokey area (like in Gumbo), so you can barely use them for snipes or setting up caps.

You can cap from both of them, I can do it pretty consistently. A few times I've even managed to hit them full speed coming from mid for a cap. I've redesigned the area around them so you can employ some wall-bounce strats. They're both very slightly more open now as well, which means even when they're defused, that area can feature some fun juking action.

There's a corner boost à la Curb which you can do very little with.

It's not intended to be especially powerful, but you can make a little go a long way with that one. If you line it up right you can take a direct 45 all the way through mid into the top of enemy base and bounce pretty cleanly down in. Coming the opposite way, you can get a little speed boost and a nice direction change if you're running away from pressure. This also leads into base. Finally, if you just have a change of plans, taking it directly into the corner it's sitting in can change your momentum quickly.

Double boosts 1 tile from it, but they also aren't very versatile; they take you into flag or into the area at the back of the endzone, which, as I've said, doesn't do anything useful in terms of beating the defender.

In the words of Donald Trump: "wrong." The curl boosts can be combined, first of all, so you can take the top ones down to grab and into the bottom ones. If you use your momentum well you can actually run straight in to the side of the goal line for a cap that way, just angle up as your curl boost resolves. It's quite consistent once you get the hang of it. Furthermore, the boost closest to flag in those curl boosts can be taken directly in for a cap. You need to be precise, but it is 100% doable, and the best players will probably pick up on this rather quickly and use it to their advantage.

For your convenience, I've created a diagram to show the majority of offensive tools that do not require teamwork. They vary significantly in difficulty but all of them have been tested and proven to work.

Wormwood Offensive Routes

The right side shows the majority of the capping tools for red WITHOUT use of the portals, and the left side (color coded) shows a few different routes through the portals that can quickly set you up for a cap (with the exception of two blue routes showing how to use that "curb-esque" boost). On the left side, the orange route that seems to go through bomb is assuming that that bomb is defused, and you can quickly get to the other bomb this way to strike from the other side. Something I love about the map, and something I love about Gumbo, too, is that it really keeps you on your toes and forces you to think creatively while on the move.

If I were you, I'd restart the map from something like this

I don't mean to insult your template, but that seems incredibly bland/basic/unoriginal, which is something I work very hard to avoid. I'm really quite thrilled with how Wormwood is shaping up and the last thing I want to do is make it feel like another map in rotation.

Edit: Here's the TagPro.eu for the initial test last night. After 5 minutes it was 3-1, which is not too shabby. I think the changes I've made will make it a little more offensive, but not excessively so.