Sounds like you are doing great! I started DS at 2.5 mos so hopefully what we do will be useful to you!
Based on what you were saying, I would say "yes, those are catches". My DS doesn't signal for pees at all, just for BMs, and so all my pee catches are based on timing and intuition. Some babies signal, others don't. So if you want to see if DS is signaling already, try giving him some diaper free time each day for a few days (at different times of the day if possible) to try and observe if your baby signals before peeing, etc. and how often baby is going. Also this frequency will change with time, and DS will likely go longer between pees. Some common signals might be grabbing for the groin, going still during activity, making a certain noise or a certain face, doing something particular with the hands, etc. For poops listen for baby to stat tooting (although BF babies do this a lot anyway!), wriggling alot, grimacing, making "groaning" noises, etc.
Sounds like he might just be letting a bit go. Try just giving him more time in front of the sink. Like 30 seconds at least unless he has a really big pee right away. Sometimes it takes a bit for them to relax their bladder. With DS if it's been quite a while and I'm pretty sure he has to go I give up to 60 seconds while signaling, unless he signals that he doesn't want/need to go by arching his back or crying. Early on I wasn't giving him long enough and as soon as I started giving a bit more time for him to go I started getting probably 25% more catches immedietly.
We only "sort of" EC at night. DS also co-sleeps and nurses right back to sleep. If he is really squirmy or not settling in his sleep or awake and obviously needing to go, I get out of bed and take him (usually this is because he needs to poop but sometimes a big pee is the culprit!). But if he isn't really waking up, just sort of rolling over to nurse I don't get him out of his PJs to take him potty. Lots of people do so hopefully someone else will have good advice on this for you. We tried a few nights but it's really cold in our room at night right now and DS was having a hard time getting back to sleep after getting out of bed, jamies, etc. and going potty.