the "outrageous attribute" problem

[Chris Goodwin]

If outrageously high attributes are a problem, give characters things to spend XP on besides attributes.

If fighters with too-high IQ is a problem, give them ways besides increasing IQ to buy more talents.

If wizards with too-high ST is a problem, give them ways besides increasing ST to cast more spells.

If wizards with too-high IQ is a problem, give them ways besides increasing IQ to buy more spells.

If fighters with too-high ST is a problem, give them ways to buy more hit points without increasing ST.

If you're running into a mental divide between "realism" and overly high values in ST or IQ, decide on whether you want the game to be "realistic" or not.

If you're worried about TFT turning into GURPS, then maybe it's time for a thread about what TFT is that GURPS is not and vice versa.