To get 4 equal tops, remove all growth from the plant except the highest 2. Top them, making each produce 2 tops. All 4 will be identical. But you have to top 1 node after the previous top. If you wait 2 nodes, you'll end up with a 4 equal tops, but arranged in a line (like a candelabra) instead of a square.

I think the curved wavy leaves and colour issue is from overfeeding. I never get issues like that (with no fertilizer). The only time I've seen anything like it was when I applied some epsom salt (magnesium). When I don't, everything is fine. When I do, I get messed up leaves.