Make lockout more rigid DT swiss fork

[Martin.F]

I have a Dt swiss opm O.L 120mm 29'er fork with a twinlock remote that I would like to stiffen up the lockout on. It sags too much for my liking when I'm hammering standing, and it also blows through the safetly valve quite regularly.

My girlfriend has a fox 32 kashima that is miles better than my fork, and I find that to be much better for my taste and riding style/conditions.

Is there any way to tune the fork in order to make the lockout be more rigid? If I'm going to have to replace the cartridge it would have to be twinlock remote compatible, so no shift-up cartridge I guess.