Well, like I said, you can load up on Strength boosting equipment while they're levelling, that would help. That's one of the reasons people play Lv.1 games when they want max-stats; their characters have 98 levels to gain with the best equipment if they start levelling from Lv.1 on Disc 3 or 4.

After you hit Lv.99 though there isn't anything you can do, except Gameshark. Sorry.