It's always gonna be tougher for the non-dominant team in a region. However, it's one of the shining awesome points of this new gym system. Max collecting is way easier and not at all dependant on longevity sits.
Old system collecting big must have been almost impossible for you. Here, try this:
Bash after midnight.
- Everyone's asleep so no competition, berry tossing shenanigans to gum you up.
- It's after midnight. Who's gonna be mad. If anything just hand out the "your welcomes" to everyone for the money.
- They wake up in the morning. "What? Stupid yellow took our forts! Screw that!" Then they bash...and give you YOUR max collect.
Next night just rinse and repeat.