I've had several of Harry's platters. You should try the current ceramic platter that he uses on his direct drive table....it is open, dynamic, and good looking.
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The VPI 19 MK IV bearing can handle the extra load of 2lbs. With centre weights, it is trial and error as you have experienced. If you want to increase the rotational mass of your platter without the need to modify your table, I would try a periphery ring. TTWeights make a ring that will fit you platter.
I personally prefer a reflex clamp over mass weights for VPI tables. My personal favorite is the Black Diamond Racing clamp. I have also tried VPIs SS centre weight and periphery ring but still prefer the BDR clamp.
Is your VPI 19 MK IV spring suspended or did you update the suspension with sorbothane isolators?
I guess I should have mentioned my ultimate goal first, which was to increase rotational mass as Brf alluded to. The problem as I saw it is if the additional weight from my 'idea' would be so much a killer of sonics to nullify any benefit.
I modified my table to accept Symposium rollerblock jrs and I use a BDR clamp. The outer ring really won't work as I use an ET arm.