Nothing that I have heard so far counts as effective isolation. Mass does not isolate a turntable from environmental noise. It does isolate the table from mechanical mishaps like skipping due to bumping into the table or using a heavy hand. The table is harder to move. Effective isolation is an isolation platform like the Vibraplane or the MinusK.
Clearaudio use to sell it's magnetic bearing assemblies in graded lengths for different thickness platters. I wonder if that one could be adopted to your table. It is way better than any VPI bearing.
You might consider a full Eclipse drive system from Sota, also way better than any VPI drive.
Get a reflex clamp like the one Sota makes.
Your tonearm is made by Jelco, not a bad thing. Your cartridge sports a 3 X 7 elliptical stylus and it tracks at 2 grams. This will lead to accelerated record wear as the contact patch is so small. Track forces that high require a line contact stylus. In that arm I would highly suggest a Soundsmith Aide. If finances won't allow it I can personally vouch for a Shure V15 V MR with a Jico SASB stylus. For about $500 you can not do better. You would have to get a super light headshell for it.