Pickup help Fender HSS Strat

Cross positing this from r/guitar

Hi everyone,

I just recently upgraded my Fender HSS strat with Seymour Duncan SSL1 (neck and middle) and SHPG1-Pearly Gates (bridge).

The middle pickup SSL1 is not RWRP.

When I play in positions 2 and 4, I get a thin tone. Is it because of the non-RWRP middle SSL1 pickup?

Is it possible to resolve this issue by switching the ground and active wires coming from this pickup?

Any advice is appreciated.

Thanks,