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I was out last night with my Precision (same as yours) and watched Jupiter rise. What was interesting was while viewing low in the atmosphere there was the distortions you described, however as Jupiter rose & the night got cooler the image got sharper & sharper. I could make out Jupiter's bands & four moons just before pulling the plug and going to bed.
What I'm now thinking is when you were viewing venus while your scope was still warm & that atmospheric turbulence may have played a part here?
If you want to send me your complete mirror assembly, I'll test it on my scope to prove if the primary is at fault.
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