They claim transaction fees are shared.  At least CryptoCompare things so (see link above).

As stated in my original post, I run about 1.6PH of hashing.

I've used ViaBTC before.  Just reread their (easy to find, unlike btc.com) fee statement.  If I'm following, they charge 4% of the block reward and 2% of the transaction fee using their PPS+ payout method.  As stated, this results in a regular block reward payment and a variable transaction fee payment - which I have no issues with.  

Since I can't find solid, onsite, information on BTC.com I guess I'll just stop thinking about them.  Then my issue simply becomes one of risk reduction via lower variance by paying ViaBTC 2% more on the block reward.  That is a non-trivial amount over a year period for me.  Quick math, using ViaBTC's number of 0.00003731 BTC/TH/Day:

1600TH * 0.00003731 * 365 = 21.79BTC/Year (all things remaining static, which of course they won't).  So 2% on that is about 0.44 BTC, or about $2500/year. You can see why I'm asking...