Nice grow going. My first grows ever were autos...over 15 yrs ago. Ain't missed a beat since even through moves. Autos should be called timex...takes a beating and keeps on ticking. Tough little suckers but they have their limits.
Nice setup...a heat mat would solve root zone temps in germ. Your double cups will make trans easier and safer...that's my method 100% of the time. A caution I'll share is while happy frog got you to this point, why not use it as final since you've obviously got watering down well. FFOF can be a bit hot for autos and may give ya a fit when happy frog roots hit the new shit. I usually trans at 1 week. Seldom have a stunt.
No input on pot size as I've never grown in anything bigger than 1 gal....ease of handling is a biggie when you been doing it perpetually for 15 yrs. Also much much easier to water properly.
Let me add...while I germ everything on 24/0 under T5HO for 3 weeks, all are moved to a flower area on 12/12.....autos stay on their genetic schedule regardless and I can grow a photo anytime I wish which I do often.
You'll find autos need less nutes than photos...aamof, a lot less. Auto genetics do not allow for much recovery time so pushing the rope will get you a tangle.