The stats I said would be the only ones leveled besides hp
If something doesn't work well, tell me how to improve
They all fail...
You need strength if you're going to pk with 80+ attack. I think you're confused with staking and pking.
With staking you want higher att than str unless you max out melee stats.
Lower leveled stakers are usually:
80 att
60 str
80 def
80+ hp.
But with pking that won't help much.
The same goes for the 80+ def 50 attack account. You're going to hit like 5 at the most with a g maul and 1 str.
Also, an attack tank won't help either. 70+ attack and 70+ def, good at tanking but you won't have an offense.
You could also be thinking of an obby pure.
You would have just the opposite,
1 attack and 80 str and hp would be whatever
Pure def 80+ with like 80+ str
Str tank (aka obby tank) 1 att 70+ str 70+ def hp doesn't really matter, will level as you level and have like 31 prayer for the extra boost.
Edit: Play around with this calculator to find the stats you'll want:
http://www.tip.it/runescape/?page=combat_calc.htm