I appreciate you only want comments from Nottingham Analogue owners only, but i met Tom Fletcher and had a good conversation with him
He much prefers MM cartridges, have you ever considered an MM?
Secondly can't you upgrade to a Hyperspace with a heavier platter?
Any and all clever power supply ie: Townshend Merlin; Linn Lingo; Wave Mechanic in essence smooths the motor - it benefits ur system fundamentally - far more than a cartridge upgrade alone. Tom said in the conversation i had with him (he was visiting Walrus Systems in london that day) the order of upgrade is power supply - heavier platter then arm then cartridge.
I have an MM in one of my decks - Pickering XsV4000 and i love its body, guts and visceral charm - and no MM's are not clumsy.