I used to have to squash strings to fit my Thumb as well. The high beams may be a bit wide, but the problem is compounded by warwick's tail pieces being narrow. Tapered strings will help, but I never had a problem fitting anything after crimping them.
Sadowsky UV75 | Sadowsky Sa200 | Bergantino NV412 | (Black) Orange AD200B (for sale) | Bergantino HD212
Sadowsky club #442