I've got a 2017 190TX with the 4S 115 on it. Same beam width as yours, same length as the 195. These boats will plane out pretty quick with the prop trimmed all the way down. Nose on mine rises significantly more than I was used to on an older PT175 with a 40hp on it but it drops back down as it comes up on plane. I can pick my nose up as I trim up and have noticed it will stay high If I try to get on plane with the motor trimmed up. As for backwash. It's common - never saw it with my old 40 but definitely notice it with the 115 - you kill thrust and the weight of the motor drops the transom pretty quickly. I just throttle down til the boat settles flat, then give it a momentary nudge, the extra wake and the bump forward kill the wash. You have to remember, that wake you are producing behind the boat is going to keep coming forward regardless of whether you stop the boat.