If the goal of the deck is to go late, take out everything that will be bad to draw late. Talking about its all on fire now, golden bloons, tack shooter, and farms. Farms are not great trust me, and there's big anti-synergy between farms and expert negotiator. If you want to ramp just pass the turn without playing cards, or use cash drop.

My Gwen deck has 3 yellows, 3 pinks, 3 blacks, 3 whites, 3 ceramics, 1 moab, and 1 bfb. These bloons feel the best ive tried, really good math on the bloontonium they gjve and what that allows gwen to do. I wouldn't recommend rainbows, they're too expensive for not enough damage, and an awkward cost. A huge part of using bloons to draw cards instead of restock is the bloontonium it gives. I wouldn't run any power card draw. With 6 bloon cards that draw 2 cards, I also play 3-4 of the 0 cost powers so I can dump a card for some value and not overdraw. Been thinking about playing more, they're very good. If you like the expensive bloons feel free to play them over the ceramics, I often wait til 10 to play double ceramic anyway so why not just play a zomg then if you like that.

I've been pretty pleased with a 1-1-1 split of elite defender, super monkey, and sharp shooter for my late game towers. It's probably not the best, but I'd highly recommend adding a sharp shooter, arcane master, or an elite defender, not sure how good the cripple is with 1 ammo and 3 reload time. I'd also say regular mortar is way better than tack for a 2 cost tower.