I'm the guy John is referencing in the above post.
Panteradise 2016 is alive and well rest assured. KB3TUO, congrats on your progression! I too just performed my first loops and flips with the Quattro. Man, what a RUSH! Nothing but the good kind of adrenaline.
As eluded to, I am doing this on using half of your pack at a head speed of 1070 RPM. I've settled on 105mm tails. It took me a while to grow a sack large enough to attempt this aerial buffoonery because this set up is great for general flying up to stall turns, but did not feel up to the task for the loop. I am sure that better pilots can manage the collective better, with time I will too.
I managed 4-5 sloppy, lethargic loops and managed to lose one at the bottom after arresting the heli with max collective. Not a dumb thumb per se, I just got caught out trying to make a pretty loop on the backside. I cut my losses trying to fight through the bog and subsequent instability and had a hard landing (but I did get TH!) The flips seem to work easier.
Get out and fly!
Chris