I can't really seem to find any information about viabtc offering FPPS, only PPS and PPLNS.
F2pool on the other hand seems like a good alternative. 315TH or more should be doable for me looking forward.
I will take a loot at novablock after the weekend, though I currently would prefer joining a rather large pool.

Furthermore I think I may have misunderstood the 48 hour warning from BTC.com
Their support told me that this only applies when a payout wallet is changed. If this is true I will gladly stay with them (unless anybody can give me good arguments why I shouldn't?)

Thanks to all of you for your further suggestions!