Vape, yes, I did detail the methods and issues I had, but no problem if you missed or don't remember, since I have the same issue with all these journals to follow!
Everything you said is great advice; and I am familliar with all three points and agree 420%, and to an extent, all were issues...
First, I only have the cloning powder, not the gel, so I didn't use any because the powder can clog the sprayers on the cloner. I know I could have bought some of the gel, and have seen people swear by it, but also saw enough people having success without it that, while I believe it does help, I don't believe it's really needed to have "good" success.
Numbers 2 and 3 in your post above were real problems for me, and along with misting the plants regularly because I didn't have a humidity dome, I believe temps were my biggest problem.
Where I live, room temps rarely get below 75* F, even in the winter. And, I purchased the new/smaller TK-24 which holds almost exactly two gallons of water, depending on how you judge the "fill line".
So, within a couple of days, between cab temps of 78* and the submersible pump, water temps would get to over 80*F. I was running the timer 50 seconds on and 250 seconds off, so running it 24x7 would have made it even worse.
I did start adding frozen water bottles to the res, but that was a PITA having to switch out twice a day, and yes, I'm aware I COULD get a chiller, but that takes space, electric, and the cost of a chiller buys a LOT of rockwool and Rapid Rooters!
In general, hydro isn't a great performer in high temps, but I thought I could get away with it with the TK because I've had such great success with the Waterfarms, but the Waterfarms had external air pumps (not submersible water pumps), plus, in addiition to the drip rings, the Waterfarms had airstones in the res.
I'll probably get back to the TK at some point and I do believe it's a great cloner, but my real objective was/is getting the cab full of great meds as quickly as possible and I didn't (and still don't!) want to get involved in a "cloner project".
I do appreciate the great input, though, and it's valuable advice for anyone with a cloner!