I thought it is only multi algo if you are mining an algo that has more than one coin. Skunk is SIGT only. I have it set to auto convert to BTC. When it mines hashtap instead of SIGT I lose about 20% or more profits compared to when it just stays on SIGT.
remember; hastap is probably only using your miner for a few minutes; not a few hours.... those payouts are instant for the amount of mining you did; not for a block reward. This is the case most of the time for me. YMMV.
the way I think hashtap work (from things I noticed), if you have an unstable or laggy internet connection; you will see smaller hashtap payouts because your machine may or may not be responding quick enough to be considered as "continuing" hashrate, and you get a small bump in pay because it triggers payout to your device...
if you look at what the pool has done; you will see there were no blocks found in that timeframe (most likely).
I used to think hashtap was not beneficial; but honestly; it does its job and is charging more than the pools last 24 hour rolling average mixed with the short term "luck" average. When I see profitability is down or whatever the case may be, I was always able to correlate the profitability flux to the hashrate flux of the pool in the stats page.