No-one asks about first-time passes on their application forms. So it doesn't seem to be the big deal everyone makes out. First-time passes are good for the self-esteem and the bank balance.
I would seriously consider going back in the sim with another instructor. Level busts and your other issues are inadequate training and a lack of building blocks that make someone a good instrument flyer.
You need to have a plan of action agreed with the CFI - I would suggest one of these items is mock test briefings - but you need a very good 170A person to give you realistic scenarios. If the exam centre is on your airfield, there is a chance that you could arrange to discuss things with an examiner, at least get introduced - they don't fly everyday, since CPLs get cancelled. This might make them seem more human.
Or, consider going to another school. There are a few that are very good at disecting issues, and building you up again ready for the test.
Everyone will feel a numb-nut at some point in their training though, so don't beat yourself up about it either.