Nice looking collection. Your decision to start with long flex heads rather than non flex std length ratchets was SMART.
Do yourself a favor and pick up a 3/8” stubby and a small 1/4” drive ratchet. These don’t have to be anything fancy. I like the way stubby flexes fit my hand. The other benefit of the flex head stubbies is your ability to reduce the moment of inertia even more, to allow your ratchet to go even faster.
If you’ve ever watched a figure skater do a spin, you can see moment of inertia at work. When their arms are outstretched they spin slower. When they tuck in, they spin faster. Don’t believe me? Go out to your garage and do some spins on your brake creeper!
Speed isn’t just about saving time. Sometimes I’m in a position I want to spend as little time in as possible. Maybe it’s my back, maybe it’s a hot engine, maybe oil is dripping everywhere.
Stubbies get some love on GJ, but in my opinion not enough. I even have a stubby 1/2” drive and I love that for all the same reasons.
My advice- start exactly where you did with long flex heads ratchets (in all drive sizes). Then choose stubbies. That’s a good automotive starting place in my opinion.