It's good that we have transmitters with mixes available.

Because not all of us are adjusting our latest design and care to rebuild the model to get the sucker to fly cleanly. And a lot of us are flying ARFs for a reason. Same reason applies to rebuilding the ARF as it did when we chose to assemble the ARF.

I flew my Ultimate biplane today. Rebending it's wing tube wouldn't have been an option. It flew like gangbusters like always. If I remember back a couple of years ago when it got trimmed, it took about 3 flights to work out the mixes. It's been an excellent ARF.