In this case you chose right. The 306G-HV is a cyclic servo the MKS95i is a tail servo. That tail from what I understand should be rock solid now.
I liked how the 250 flew also I just really disliked the tail authority. I think once you solve that it has the ability to be an excellent heli. From what I know the 306G can be an ok tail servo better then what you have now. It's an imitation mks95 and I use them on my cyclic for my trex 450. They are excellent servos and high quality better then anything Align has. But for proper tail control you will want a real tail servo which is the mks95i
So from the research I have done that wobble causes some binding and there is a video around somewhere where someone put a force gauge on the linkage and it took quite a bit of force to move it. You actually have to do the tail mod correctly for it to work. The crush spacer is a crush once type deal. If you over crush it it useless. This is common on more then just heli's when I replaced the ring and pinion on my old blazers axle it had the same crush spacer concept to preload the bearings. So this is probably why you gets reports of it working and not working. People dont do it correctly. The after mod was done load on the linkage was down to nothing. Which the stock servo then works just fine. The reason for the MKS95I is it will over power the binding and isn't effected by it. So you have really over killed this repair but that tail should be rock solid now and you should have an awesome flying trex 250.
