BigNed,

I think I know the answer to your problem #1. It is due to the ailevator function. It is the servo in channel 8 that is slower than the one in 2, its purely a function of the mixing/programming software, which gets the signal info to channel 8 slightly later (on the order of milliseconds) than channel 2. All radio brands experience this. The same thing happens on mine, I have 9CAP and Hitec 605 servos on my UCD. The speed difference is clearly visible on the ground, but it never translates to an observable (rolling, etc.) effect in the air. I've learned to ignore it, even though I hate to see it. The only way to solve problem 1 is to use a reversing Y and have both servos in channel 2. Then there is no lag between the servos since they are driven by the same signal.

The other problems you speak of I do not have, sorry. If the endpoints match, and the centers match, all the in between deflections should match - everything is linear. I can't figure out why your problem would appear. You can't accidentally program expo into one channel of the mix and not the other, can you? I.e., channel 2 is linear and 8 has some expo? I don't think this is possible...

Hope this helps some, at least with #1,
Kurt

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Adding a link to a [link=http://www.rcuniverse.com/forum/m_392785/mpage_1/key_ailevator%252Cservo%252Cspeed/anchor/tm.htm#392785]related thread[/link] which addresses this issue.
Here is [link=http://www.rcuniverse.com/forum/m_1384561/mpage_1/key_ailevator%252Cservo%252Cspeed/anchor/tm.htm#1384561]another.[/link]