ok first things first. At lvl 23 u can make a new char. IF u do not want to(and it is perfectly understood, trust me) u can respec your feats(ONLY your feats, not your powers too) for an X amount of Astral Diamonds(aka ADs) which indeed increases as u lvl up. U can get ADs from: -completing daily quests(skirmish, pvp,…
I find my 18 str 18 con dwarf going way more smoothly than my 20 con 13 str thiefling. I too like the rest believe that str is of much importance but try to keep a balance between con and str...don't go full rambo on str and find yourself lacking HP.