Try to avoid staking with low armour against pures. If they accept like plate+legs+wep on, you could try.
Buy both torag and verac. Whip, obby set, d boots, fury, c brace. Always wear ''fake clothes'' so people wont guess what you have.
Against rangers use torag + whip. + Excalibur spec.
Against melee use verac. + Excalibur spec.
For low armour fights 1-2 parts use dds specs.
Some tips:
-Always look up your opponents stats so you will learn what kind of stats you win with what kind of armour on/off.
-Use ring of recoil.
-People with higher att/def, lower str then you will win you.
-You can stake higher lvls if they dont have enough def to wield barrows.
-Never stake too big amounts. Secret of good staker is not to get cleaned.
-If you have a bad day and keep going on minus, quit in time.
-If you have a good day dont think quitting while you are ahead, keep staking as long as you can.
-Make higher lvl people 2-3x you even if you have better stats.
-If you get beat by someone 2-3 times dont stake him again. Dont let your gambling desire take away all your money.
If you have any questions feel free to PM me, i've staked with an account similar to your stats; 75 58 70 and i've been using bets around 200k-800k and been able to win average ~500k per hour.