Thanks for the detailed reply! I know we are hijacking the thread, but I don't think anyone would regret reading this.
In the past yes, can expect a block from a decent quality loop. But I've been playing against better players lately who will counter attack anything close to a "slow loop". Maybe I was looking too much for safety margin and too much energy is wasted brushing upwards. I'll try training the snap/explode with limited body movement, thanks. Yes, syncing body and arm is a problem for me too.
As for single sided penhold. Long story short, and I'm changed a few different styles over the years. But after having a good coach work with me on RPB for ~8 months, it still didn't feel natural. The optimal grip, racket weight, stance etc all needed to be changed and I felt every little improvement to RPB required sacrifices for either the forehand or traditional backhand (I refused to give up TPB altogether). I found that in order to have a strong and reliable RPB, I had to grip the racket in a way that traditional blocks are nearly impossible against heavy topspin, and no matter what you do, RPB didn't have enough angle control to replace traditional blocking.
Lately, I worked out a fairly consistent traditional backhand loop which I used against long serves/pushes, but yes, backhand attacks are at most a jab nowadays, and I do miss the rpb flicks. Short pips only makes smashing very good, but everything to get to the smashing phase becomes harder, haha.
I know it's a dying style, but I enjoy it, and have no intentions on turning pro.