I think a more important aspect than float shape I've been getting wrong is plumbing up, been plumbing up to where my float was shotted, so think I've been underdepth most of the time, could be why I miss quite a lot of bites. More practice needed in that area I think before I worry about float choiceThe only person who ultimately will know what you want/need is yourself.
You can get as much advice as you can but only you can put into practice on the venues you fish.
Stick to basic patterns and ask other anglers what they are using and why on the waters you fish.
Then add to what you have but always understand why you have certain floats and their usage.