Welcome back.
I'd say if there's nothing wrong with the tops you got, why change? I'm finding the Spintastics Trompo Grande and Trompo Bearing to be just fine. The Quicksilver Hybrids are probably a much better option in both fixed and bearing tips. I find as long as you have 2 tops you like, one being a bearing and one being a fixed tip, you've got all you need!
Hard to say which sites are the best to learn from for tops, but this is definitely the right place. Do some YouTube searches, you'll get a lot of results. There's also plenty here who want to help. I'm still learning myself.