Hello and welcome again

Sorry to hear how tired you are feeling - try to use every opportunity to take a break or nap any time possible!
You've done brilliantly to start the EAS cycle early on and it sounds like your LO is well on his way to self settling too - that's really great!

In terms of the routine and short naps, it looks like your A times are too long for his age. We have a list of guidance A times here:
Average A times- BOOKMARK ME! You will see that 3 months (which your LO is approaching, roughly ) there is a guidance A time of 1hr 20 to 1hr 30. Looking at your EASY sample the A times are much longer than this, more like 2hrs. The guidance times are only guidance, some parents observe that their LO does much better on longer or shorter than the guidance and that's fine so long as everything is working but when things are not working so well let's start with those times - I suggest from now you aim to have him asleep after 1hr 20 to 1hr 30 max. The A time is the *entire time he is awake* regardless of whether he is eating, having nappy change, singing songs or the wind down routine in readiness for sleep - it is everything from eyes open and awake to eyes shut and asleep.
It think this might be where you were a little confused, I know in the book A time is described as after E time but the E is part of the A, I hope this makes sense to you.
Now, then as he is eating for a long time this means that you have very little time to do much else, feed, nappy change and perhaps a few short minutes of interaction and then begin the wind down. Some babies like the full 20 minute wind down as described in the books, some do not (mine liked about 3 mins) so check the time and begin your WD based on how long you know/think it will take and with the aim of sleep being at 1hr 20-30 after the last wake up time.
I suggest you try to reduce and stop the falling to sleep on the breast, cat napping on the breast makes it much harder to work out the routine as he has not been awake the full time. It might be easier to stop him fallign to sleep on the reast once he has shorter A times and is getting more rest.
If you do need to resettle mid-nap that's fine, continue as you have been doing - you might also want to try a W2S
See here, scroll to "Naps wake to sleep option 1" and adapt it a little for your own LO. As you LO is waking at 30 mins you would not enter the room at this time but earlier, say 20 or 25 mins and begin shush/pat to help him remain calm and sleepy and help him through the sleep cycle transition. You might like to try for a new days to see if you feel it is helpful, it can help LOs transition rather than fully waking and can be useful with OT wake ups. You would not aim to do this for ever, a few days only. If you are too tired or busy to do this every nap I suggest you pick one nap per day, it is useful to choose the same nap each day (nap 1 is a good place to start) rather than changing every day.
Increased NF (night feeds) can certainly be a growth spurt. Your supply is increased during the night. The feeds look at least 2hrs apart so I wouldn't worry about this as it may pass in a week or so. Increased NWs can also be due to OT but I would expect him not to feed if he is not used to feeding to sleep (habit/prop) and if he is not hungry.
If he naps longer and goes past his E time I would let this happen without too much concern unless it becomes a problem. Healthy babies generally know what they need and might prioritise a nap over food when they are very tired, yes he'll likely be very hungry when he wakes but he will eat straight away.
I hope I answered all your questions. Please let me know if you need anything explaining.
By the way, your English is great

Let us know how you get on.