Definitely seems a balance issue. I had the same on my 102SLT until I rebalanced during the day with my imaging cam attached. Also make sure the tripod is level (I assume it has the same bubble level as the 102SLT) as that upsets the balance. Don't forget to plug in all the cables you need for imaging as the weight of the cable from the cam will come into play with the balance, as will the slack of the cable...it if gets caught on the tripod or you have it pulled tight to a computer a long distance away this will add tension to the scope so it'll drift.
On the barlow front, the more magnification you add the more the seeing degrades for imaging (or an eyepiece). It's also adding more weight (and increasing the distance the camera is away from the balance point. So tracking will be even further put off.
You may also want to take a look as trying out FireCapture. I've switched to using that rather than SharpCap. Has some handy features, and cropping the resolution down to what I need gives me more frames per second for capture. It's not as stable and its more processor intensive but I definitely prefer it for now (I always avoided looking as I assumed it was for Firewire cameras only, but its not).
How good your image ends up now will be up to your processing skills
