In reply to ianlaw:
Hey Ian
I'd just take one full set of wires and a 1 to 5 half set, the torque nuts and cams, slings and the QD's you propose sound fine. The single rope would save a lot of faff at belays etc and you could double it up for key pitches if you needed but the routes you are planning are fairly straight anyway. Are you both ok with swinging leads? This'll save some messing about for sure. Don't forget a first aid kit <and who has it> and take off any passcode security off your phones so you can use each others mobile should you need to. Perhaps consider some poles if you have some, both long walk outs, you don't want to knacker your knees up on day one!
I'd consider switching route days TBH, do grooved arete sunday and the slabs on monday. Plentry of folk will be on tryfan sunday should you need assistance but the pitches seem to clear much faster than the ones on the slabs. Monday sould be a little quieter for the slabs to give you space the breathe a bit. Your packs should be pretty light by the time you are climbing and using the compression straps you should be able to tighten them down to make the packs really slim. Don't forget your camera, Tryfan and the slabs have been the start of many a mountaineers career. Have a great time.
*Ampitheatre buttress is a fantastic alternative day should things change