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I'm just wondering, have you tried a torsion test on optical tube and the mount/base?
Try placing the optical frame only it standing upright on a concrete floor and attach a laser..then place a mirror on the ceiling so the laser bounces off and reflects on the floor..With the laser on, try and adjust the focuser..etc and see how much play there is...then support the tube by the hubs using some drink crates or whatever and test again..next is the mount by itself..giving it a firm rap at various places...then the whole lot together..this is a way to find out where the most likely cause of movement.
I hope I don't sound too critical...but your scope looks cool and has great potential!!
I know it will work out for you!!
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