I do not have my PPL so ignore me if this makes no sense! - I am trying to finish and get the first milestone!
When I did my Flying Scholarship, I was always taught once you have commited to the "death turn" never increase the bank angle. If you are going to over shoot the runway hold the turn a little longer to turn you back on an intercept heading and re-establish the centreline. If not or you have doubt - Go Around.
It was always said to me that you are going to probably be losing airspeed in the turn, and although you'll be fine at a normal bank angle if you increase it you could increase the stall speed above your current speed. so it's best to keep the stall speed where it is, and if you get buffet reduce the bank angle - and Go Around!
It is a while ago I did this so memories are old... but that's what I remember.