With studs in concrete we'll some times give them a little tweak in the right direction with either a length of pipe slipped over them or two nuts on the end and a club hammer.
Your best best likely to enlarge the odd hole in the timber.
Should have pre drilled the ledger, drilled through to spot the wall, removed ledger, drilled to depth. Put all the studs in in one hit. Pump in the resin push in a stud, onto the next. Ledger would have slipped on pretty much with the odd tweak on the stud with a club hammer.