Maybe off topic but have you considered just moving 2 batteries to the starboard side? Extending the cabling is easy and will reduce your weight. 5 Batteries on a 248 seems more than necessary. Do you spend a lot of time anchored up without shore power?
I had a 258 and moved from a F4 to an F3 to get better hole shot. My kids were wakeboarding behind our boat and I traded off top speed for quicker planing. Your problem may be moving to an F5 may affect your ability to jump on plane at the same rate you currently do. Do you have tabs to help?
Welcome to the forum.
_________________
Jnizi
2007 Vista 338 "Better Yet"
Previously:
2007 Vista 258 " Just Right"
2005 Horizon 230