Hi im coming upto 4 weeks post op n also had Mr Traynor. Tbh i havent found the no bra an issue as i first thought it would. The trick is to get some plasters in to put over your nipples so noone will have a clue your not wearing a bra 
I only started to wear the plasters a week after my op when i returned to work and removed them at home as much as possible as it cqant be good keeping them covered 24/7.
Failing that make sure you have plenty of vest tops that you can wear a loose top over that also seems to disguise the nipple problem.
As for the op your having 340cc unders same as me also, im petite and unders take longer to recover but with my frame i also was a couple of days behind recovery too. My nurse said it was normal but either way i felt heaps better around 8 days post op. You wont be bandaged up, just 2 big plasters that go across the length of your scars. so you will beable to see all 75% of your breasts. Alltho i would say they dont look good at that stage and sit on your chin practiclly lol.
But dont worry im lovging mine now as im sure you will too, good luck with your op and any more questions just ask
xx