Questions about mining with a L3+ farm

I've been out of the game for a couple years, it's taken me this long to get over the Cryptsy scandal. Moving on...

I just setup an L3+ Antminer farm of 20 machines. I'm currently selling my hash power to Nicehash, which seems to be the best option at the moment, but I would like to increase yield if possible. Right now they yield about $20/day +/- $5

My searching has yielding old info that doesn't seem valid anymore.

What pool and payout method is yielding the best results for you? What would you do with these machines? The answer resulting in the highest increase of profit will surely be rewarded. Those who know me from the old Cryptsy days know I pay out.

I also have another question. I recently found 5 blocks in one day, yet when I try to solo mine, I went an entire day without finding one. So, is it easier to find blocks when on Nicehash? If so, why? I'm just trying to understand how it works.

Thanks,
01001101 (the original)