To test everything in the turret itself you might try swapping receiver cables so you have throttle on the left stick and steering on the right. Then you'll push the right stick halfway forward (assuming you have throttle on left stick) and move the left stick from left to right to get elevation. It might not be exactly halfway on the right stick, but you'll be able to play with it to see if you get better response. If elevation works well like that you know the problem isn't in the mechanics in the turret, but is somewhere in the board or the TX. Sometimes small trim adjustments can make it easier to use elevation as well. I usually run my tanks with throttle and steering on the same stick, but clark is the exception, and every tank I've had with a TK22 has been set for throttle on left stick and steering on right. I got used to driving like that with my halftrack so the switch back and forth isn't a big deal for me, but I've heard some guys have a problem with that. Too bad you can't change the sounds on the clark. Then you could run that in the PzIV and get an IBU for the Tiger.