Wow, I'm a little late on this topic....
I had pretty good luck with the 208xt, but I do remember that it took me awhile to get
it singing. I recall that playing with the calibration settings was the biggest factor to get
it to run correctly.
Other tips I can remember:
- It does need to be fairly square to the axis.
- Take a new darkframe each time the exposure setting is changed.
- I *think* there is a "seeing" adjustment, that is basically the "agressiveness", and can
make a difference when turned up a bit.
- Focus is fairly critical - those cheap chinese 10mm plossls are parfocal.
I do remember that the 208xt was able to guide on some pretty faint stars for me - I was amazed actually at how faint it could go.
It is a bit of a trick figuring out the settings with your own mount.
It sounds like mechanically adjusting out some of the backlash is a good idea (if possible). I used to have a
classic LX200, and it was a VERY good scope, and had no real backlash. At the same time, it had been Supercharged
by Dr. Clay. He is very knowlegable about the ins and outs of the LX200's - you might wish to contact him regarding
supercharging - it makes a huge difference.
At any rate, your 10min shot looks great, so you must be doing something right. I agree with the others that it sounds
like backlash may be the culprit. I'll post more if I can remember what else I did.