Vitor Bastos
Explorer
I'd actually shoot for Lv. 8 with Resilient (CON). That's one level before you'd get Haste, and you REALLY want to keep concentration on that one.
So, with the Variant Human, I'd recommend:
Lv. 1: PAM
Lv. 4: GWM or +2 STR (depending on your party makeup)
Lv. 8: Resilient (CON)
Lv. 12: +2 STR (or GWM if you didn't take it earlier)
Oh so Haste is a big part of this build too? (sry for the noobness)
I didnt quite got time to read your whole guide in detail etc.
There is a situation though, the DM said that the campagin should end around level 10. With maybe a small possiblity of extending it.. but thats not for sure...