What angle should I set the VTA on my VPI turntable?

Hello,
Not even close to an expert here. Here is my two cents. Please do a final VTA adjustment after about 50 hours or per Michael Fremer set it to 93* when the cart is new. As the cart breaks in or settles you will lose about 1*. I think the angle is 92.3*. After a lot of playing you will naturally get to this. Or set it to 92* at the beginning and recalibrate after 50 hours. Regardless once set up I would do a listening setup. That’s what I did when setting up the Prime with the unipivot arm. 

Hello,
One more thing. Please do not set up your table with a cheap bubble level unless you checked or calibrated it with a really good level. I have made this mistake and found out these cheap bubble levels are not true. Your albums and your cart are not cheap. Please do not wear your gear out sooner than it should. It has been proven that a well set up cart sounds better and makes your cart and records last longer. I’m not trying to get on my soapbox. This equipment is not cheap and some of these albums cannot be replaced. I hope this helped. 

Miller:   "...I lose interest in tweaking..."

SURELY NOT !!!!!

 unipivot. and some tonearm style do not perform. well if it's way above the parallel setting.. either compromise. or find a better mounted cart.

I suggest look up all the videos and article by soundsmith Mr Peter and by Mr Michael fremer.. a mixture of accuracy and compromising art it is. 

@lewm, using a USB micoscope to set SRA is very accurate. You take snapshots and measure with a protractor to a reference line that is perfectly horizontal. I use a laser level. The toughest part is holding the microscope fixed in the right position without any wobble. Once you have a microscope stand figured out it is a breeze.