Some questions re: RST Loads

[BRDHNTR]

After shooting skeet this past weekend and while cleaning my 20 ga repro, it seemed to me the barrels had heavy fouling. I was shooting RST 20 ga 2 3/4" Lite 7/8 oz loads at 1100, #8 shot . Are these loads prone to heavy fouling? Powder residue seemed to be more than I'd expect. Do they make another load less prone to heavy fouling - burns cleaner? Any thoughts, recommendations? Went through quite a few cleaning patches before the barrels were cleaned. Do they use a slower burning powder on their 'Lite' loads which results in greater fowling than not? Just a thought.

Also, I haven't been yet to an event where RST sets up their tent so I've purchased a couple of cases via their web. Are their prices any better at these shooting venues? Any special deals on prices at the various events they attend?