pra, don't let scratchx or 3M SR dry. upon applying, you work the product in. any excess product is then removed with a good quality MF. that's one of the reasons why you had difficulty in product removal. then, rewax that area.

as for QD's, try Eagle One. best bang for the buck. but if you have time, try to look for Megs #34 Final Inspection. You can get that by the gallon. tipid ka in the long run..
Now I'm thinking of washing my car and applying 3M IHG then SCLW one of these days.
one of the fun parts in detailing. you get to try out different combos. later on, you'll get to settle with the "look" that you'll prefer. after all, it all boils down to your own preference.