Total newbie here...

...I just picked up a sweet new Trek Roscoe 27.5+, and my fat ass is too heavy for the fork. It's a RockShox Judy TK Silver 29" with a "Red Medium" coil spring; which is rated for 160-180 lbs. I'd need at least a "Blue Firm" spring for the 180-200 lb range, or maybe even a 200+ lb "Black X-Firm."

Problem: RockShox doesn't sell any stiff replacement springs for a 29er plus with 120mm travel. I also don't know whether a SoloAir will fit in my lowers.

What options do I have to make my fork stiffer?

Any help would be fantastic. Thanks.