i wouldnt bother with negatives. You cant transfer your 6 repp max to a bigger single because you lack practise with heavy singles
heavy singles is another art form, repping does very little to help it, only an indication of increased strength, especially in lifts like bench and squat.
Many ways to approach this, one idea could be to have a session where you do:
5 sets x 2 reps x 42.5 (last warm up set maybe 2x35?)
and if thats ok then next week:
5 sets x 1 rep x 45 (last warm up 1x40) - normally wouldnt recommend that but i have a feeling you might be able to do this judging from the 6 rep max?
50kg is in the bag already vegieburger, its just a matter of finding it from there