Definitely time to transplant!
Here's the problem with tiny pots:
Not only do you have wild fluctuations in moisture, and it's hard to keep up with watering, but the amount of actual media compared to the amount of root mass is relatively small, and you'll see problems with soil chemistry too, resulting in nutrient lockouts.
Bigger pots time! First, and do this right away, FLUSH the pots well with plain tap water at pH 6.7 to rinse out any excess fert salts. Let the plants chill for a day or so, long enough to dry the soil out again. Now find a pot that is about a gallon per foot of stem height- your plants look like they would like a 2-3 gallon pot. Take your favorite soil mix and add more perlite if it is not freely draining. Find the level that the plant should sit in the pot, fill the pot with soil until it will hold the plant at that level, put in the plant (turn the whole thing upside down and slap the bottom of the pot hard- the root ball should slide out with no damage), and backfill around it with the rest of the soil. The soil surface should be the same in relation to the STEM, and an inch below the rim of the pot. Now give a LIGHT watering with a ~1/4 strength fertilizer solution. If you have superthrive, now is the time to use it- only 1 drop per gallon! more is not more, lol
good luck, they actually look great for being in such little pots!
Oh- my Affies have red stems too. The leaves look healthy, nothing a re-pot won't fix. No worries mate.