Well I'm a novice too but here's what I see:
Tiller is even, so that's a good start. However it also looks like the only the first half of the limb is working. More specifically it looks like the only part of the limb working is the first half as it leave the handle section. It appears that you need to have most of the limb bending up until ~6-8" to each tip.
I'm afraid that if you do not improve the tiller, that part of the limb which is working the most, will eventually fail or weaken. However I also just noticed this is a r/d design, so maybe that's all you want to bend anyway. If that's really a r/d design, then it is probably already bending near the ends pretty well.
Just my two cents. It's always so much easier for someone else to critique, so please don't take it personally. Like I said, I'm a novice at best. Good Luck!
Joe