I just wanted to say we are having a similar thing with our nearly 7 month old. Coincidentally, I was just going to pop on here and ask the question if I should be really forcing a longer A time because, like you, my little guy is rubbing his eyes, getting fussy after just 2 hours.
Thanks Lauradj for answering my question before I asked it! I will as well, try to really push that A time. Some days he does really well and we only do 2 naps, but others (today) he didn't nap well, and I went with the eye rubbing and put him down, so we're on 3 naps. I'll keep pushing that A time because I think he will let me push it out.