I have a question, if I should use different wallet addresses for my different mining rigs when I use the p2pool.vtcpool? Thank you.
Yes, the new p2pool update adjusts vardiff on a per-client basis, so to get the right size work for each rig (to maximise profitability) you should use a separate address for each rig.
Oh, unless you set that manually right? I just use the same wallet with a different value after the +, seems to work fine.