GHS Booomers are definitely higher tension than 7250s, XLs. Probably equal to Rotos.
Lo Riders are medium-low tension for a hexcore round... not sure why people think they're high tension.
The highest tension roundwounds I've had experience of are the OLD Fender 7250s in the sky blue packaging.
Honestly if I were you, I would just try a higher gauge string, think 50-110.