I decided that the time between loses would net me enough profits at short term rate that it made this kind of pointless
I suspect the losses / time frames you are looking at are too small for you to effectively harvest as a non-robot. What loss percentage are you looking at, 3%? 10%? 20%? What is the absolute dollar amount?
Personally, if it's under $1K in loss it really isn't worth it due to transaction costs (and yes, there are costs beyond the trading commission). The smallest one I've bothered to capture was about $2300. If it's under 5% or so of loss, then I agree, there is risk of things moving quickly enough that you may have to stay in the "alternate fund".
If you move from A to B, you eventually need to decide if you sell B and rebuy A or leave it in B. How big the short term gain is will matter, so any funds/ETFs you rotate through you will want to have as things you are willing to keep.
IMHO, look for a 10%+ pullback to harvest. Could be less if you have significant $ volume, but it needs to be $thousands to make it worth it. Otherwise, there is too much conversion churn in trading expenses and risk of the market moving while you are doing the transaction. (If you move 200 shares and you lose 5c/share between the spread and things moving in the few ticks it can take to do the sell/buy, you've lost $10 in the transaction even before any trading fees... do that both in and out of an ETF and pay $5 for each trade, and you're risking $30... so if you didn't capture on the magnitude of $3K in losses, the trading overhead will eventually sink your returns more than any financial advisor would).
The last time I did loss harvesting was late 2015/early 2016 (specifically 9/24/15 and 1/18/16). I was "lucky" enough that my interim funds captured a pretty big short term loss (a good 3 to 8% - ouch), so I didn't have to leave funds "elsewhere". Previous time was late 2008/2009 (There was likely a good opportunity in August/September 2011, but for various not-important reasons that didn't work out for me)
I'm in no rush to find more capital losses, though I will take them if they are significant enough. As it is, from the loss captured last year, my line 16 of Schedule D is negative 5 digits. I have remaining capital losses for YEARS of future taxes.
EDIT: Converted to a generic "Fund A and Fund B" to avoid specific funds in the example. Bender, below, brings up a good point and I don't want to make any implications on what is/is not valid.