model 3 converted to model 4 speedster

[foxkit3]

I recently installed model 4 speedster wings on my model 3. I have already changed the cowling for the more sloped windsheild plus i installed the thicker windsheild 00.90. Still have the original virtical stab and rudder. next winters project. Still using the original mixer. the plane flys alot better now. landings are much more predictable. climb out is not that bad with 2 people running a 912 ul. Would it be worth it to replace the mixer?? adverse yaw is not that bad. cruising about 115 mph with ivo inflight prop. love the plane now. here are some pictures