I have a 1997 225 Vindicator model E225STLEUD on a 400TSD Javelin with 6 inch Bob's Hydraulic jack plate. Water pressure at 5500rpm is around +-25-30psi. In the past when I raised the motor with the jack plate pressure would drop. I would keep it above 18PSI. This past weekend pressure would actually go up and would run well above 40PSI and go up as I raided the jack plate it would drop down when I lowered it.

My question is should I be concerned that there might be an issue? Only started doing it this past weekend. I know low pressure is not good, but high pressure is probably not good either. Any advice would be appreciated.