Ok, Implants are one of the major things Funcom didn't like being 'overequipped'.
How would folks feel about this change?
Make implants NOT require treatment (or minimal treatment) to install, but change the 'stat' requirement to be your 'true', unmodified stat. (The game has to know this anyway, to figure out how many IP to charge for a raise).
So, to do a QL 90 Implant, your real, no-buffs, no-implants Stat must be 184.
Instant fixed cap on how high a QL you can equip.
Of course, you might talk about the multiplier of QL to stat, but this general idea allows control without worrying about 'laddering implants', etc.