Hmm well since Thea has got fitter and her back muscled up thanks to long lining/pessoa and using her self better now the ulcers have gone, I've noticed the Vogue is working its way forward when she is worked in it, I have to stop periodically and move it back even when she is being fairly sedate.
I use a Professionals Choice girth and a regular saddle cloth and the saddle fits beautifully level still, its just started to slip forwards (she has quite a forward girth groove which also pulls the saddle forwards although this wasn't an issue with the Vogue until recently - I guess her big belly isn't keeping it all back now!

). The PC girth helps but doesn't eliminate the problem. I have tried the mesh grippy stuff but she objected to it. If I shim the front it tips the saddle back.

She is due a rider back up this weekend so I will see how it goes with a rider up as she won't be doing anything other than walk and possibly a little trot on day two if day one goes ok.
Any ideas chaps?
Heather - any news on those treed saddles? (Just in case!).