All I did was invest heavily into strength at the beginning, then once about level 100 I started to rain it back in.
Right now I have about 30 points in Con, 70 in Dex, rest in Strength. I’m 188 at the moment though.
On the heal front I actually think rank 10 Mass Heal is better than heal in the late game. Since it’s percentage based, where as heal is based on spirit/intellect.
Either way though both are viable of course. But I definitely find Mass Heal infinitely more useful than heal. That said I only have rank 5 heal for obvious reasons.
But yeah spam most of your points on strength, for easy earlier leveling. Then bring dex & con inline later.