The only issue with L7 bolts, IMO, is that they turn your marker into an unbalanced spool valve, and require INSANELY good tuning to get proper efficiency. If you REALLY like teching markers, L7 is a great bolt. If not, you're more likely to wind up with a marker that shoots worse and gets worse efficiency with a L7.
There's a reason you rarely see aftermarket bolts in Matrices. Dye did their work and there aren't any the RELIABLY increase performance without a lot of work. My DM5 has an orange sam bolt, which is really nice since it's the same design as stock but a bit lighter, but only has it because the stock was damaged and it REQUIRED a replacement. And if the stock is damaged is the only time I'll recommend an aftermarket bolt for any newer than the Gen-E matrix style (which is the same as the so-called DM3)(those there WERE great aftermarket bolts for)