900-100m/hash setup + unlimited electricity-Suggestions for optimization

[BitCoinUnited]

Sup everyone

Recently started with a setup (3 7850-AMD ATI Radeons) with some tweaks here and there got to about 900-100m/hash. A big bonus is that we don't have to pay for electricity in the building so that saves some overhead costs;)

The thing is in the SlushPool, the reward is very low (have like .4BTC so far in 2weeks) which makes me wonder:
-Is it best to upgrade to more power OR
-Switch pool and if so, what are the be determinants to look for-its still a bit confusing for me

thanks a lot for all suggestions & help

BitCoinUnited

[vm1990]

if i had unlimited free electric i would buy anything that could hash. as for pools there all in theory the same and should yeild the same rewards over time but that said slushs pool is one of the better ones. also bitcoin is constantly getting harder and harder to mine my rewards have halved in the last 2 months. if you want the best possible solution its to buy a new ASIC but like i say if its free electric its profit mining with anything you can think of