Haha Looper Trooper,
I was just randomly showing up to cause trouble that day (and make a TON of Cappucinnos !!!)
I am also glad you showed up, it is part of the trouble making missions to make new friends and create more fun. The red M+ I sold you had maybe a couple hundred hours on them, garbage time for most rubbers, but it still had/has half its life. The Black Karis M is magical, everyone buys black M, it had 500+ hrs and could prolly take another 100-200, I felt bad asking $10 for the red and gave away the black M, glued it on your bat.
The sensation will be different of course and you will be changing your impact to adjust to them, but have a lot already. Karis is a BOSS vs topspin, not so spin sensitive, plus you can make your own spin, it won't be overpowering fast, but you land more shots and it is what we all need to do. Yes, you BH punch vs a heavy loop where you impact real firm on the rise is VERY EASY to perform with Karis M, a very under-rated shot in the topspin game. It isn't just the rubber, you have to time it on the rise, and firm up right on impact, but the rubber makes that job a lot easier.
I hope your elite amature 2400+ friend shows up there a lot more too. Bounce ideas off him, if anything I say rings of bullcrap to him, listen to him first, and try out the things yourself. He is right there boots on ground with you..
I gave you the abbreviated express versions of each of those concepts. I am surprised you remembered more than three things. Usually three is the largest take away you can expect anyone to remember in any kind of speech or training. Work on the staged progressive approach to learning your grip and swing timing/impact for underspin off the table... it will pay off big time down the line. Save your at table practice for when you get the timing and impact/bat angles good enough.
You saw the BH fast loop drive with zero backswing kinda sudden impact... but I got a lot of other BH shots. You prolly saw my SLOW heavy BH topspin. I usually show off the fast BH to demonstrate that one can really crack it without all that windup that can wreck timing... plus to show the basics of bio-mechanics/whip mechanics. it is a real important talking point... but it isn't much different from what Carl, Next Level, or many other forum members would be able to show you. Practice receiving serves what we went over receiving soft hand off the bounce, practice that now while you don't need it at your level so much. As your level gets higher, you will be WAY ahead of those trying to learn it... that will up your level a lot down the road.
Yeah, I get a giggle outta the "Good BH rubber?" threads, I can make it work with about anything, but again, a rubber can make things easier. I prefer CONTROL rubber on BH, that is why I could do it real easy with Karis, XP2008, or your old Srivers.