That may require a 4 blade propeller and we don’t know what propellers you’ve tried though a 175 SHO is smaller cubic inches and they don’t have torque that larger cubic engines have. The Pantera Classic hull does much better with more cubes, where the Pantera II is more versatile. There is a difference between the hulls.
Alright, we would visit with the dealership and see what options they have in a four blade to tryin any brand that is between a 22” and 21” for three people. If you were fishing with two people more often then perhaps a three blade would be fine. In your case we think a four blade will help.
BCB