I have a 31 sunseeker hawk with 1994 volvo penta 502s pushing DPXR drives. overheats over 3500 rpms fresh water cooled, new water pumps, heat exchangers, manifolds and risers. need help? should I run direct strainers? thru hull and forget the drive pick ups? that's all I can come up with? any help greatly appreciated! 🙏🙏