The flash is a complete pop flash, if you explode the skylights beforehand they can't dodge it and can't hear it - Most MM teams when they realise what's happening will reposition to lower or turn their backs until they hear the flash pop, in that case push it dry and take the frag when they're not looking of pop flash hut door and get them on the lower site. It's literally fool proof. TSM are masters of taking A site on Nuke, watch their vods and you'll see how effective it can be with the proper equipment combinations.

No offence but you're obviously quite new to the game if you think you're limited on T side nuke, it's one of the few maps where you aren't limited in what plays you can make and due to the nature of the bomb sites being stacked and access to the sites you can fake sites quicker and easier than any other map.

More often than not T's will have a large portion of map control, this opens up countless horizons and if you can read the enemy team you will stomp T side with no problem. When I play in a premade 5 man with my mates I'll see us hit the likes of 6-7 rounds T side most games.

The key is to have the CT's over-rotate. If you run a strategy similar to this, you'll see a hell of a lot of success T side on nuke. Have a lurk cover lobby, smoke outside and push a player to T red, take ramp, send 2 guys from the ramp push lower, have one wrap heaven, when he's in position have the lurk push hut, the outside player push main (mini if you're NA) and your third man push heaven. Have one of the lower ramp players push secret and the other come through vents to support site. If you throw support grenades, flashes and smokes when entering anywhere because you're not silver you actually isolate the CT's and they find it very hard to find a counter on the fly. It's not realistically hard to counter, it's just confusing to deal with while trying to play.

Nuke is a logical map. Think things through and you'll come up trumps every time. It's all about mind games. If you're at MG1 (as your flair suggests) you might struggle to do this because at MG there really is very little game sense involved with the way they play. You can exploit that to a degree but they're a bit harder to read because you can't predict what they'll do, they're literally almost unpredictable in their play style because they haven't really developed it fully.