Hi Carrie,
Sorry you're still in the midst of a EWs

I tend to be a couple steps behind Finn in terms of what to look out for next.
I actually don't think I ever got those 1.5 x 2 naps between 6.5 months - 12 months. I'm sure I had a few, but my memory is a bit hazy.
I have to say, I never did the short AM, PM nap..just bc I could -never- figure out my daughter's second A time. As the months went on, it just kept getting longer and her naps went from 1 hour...to 50..to 45..to even 38 sometimes. She would wake up crying (this was around 7-8 months) and sometimes I managed to get her back, sometimes she was like 'no thank you'. She's really precise with her sleep needs. If she gets more during the day, she does less at night and vice versa.
I kept her first A time pretty consistent, Carrie, for practically 4 months. I was always hovering around 3-3.5 hours of sleep and it always yielded me a nap of less than 1.5 hours. I think I can count the number of times she gave me 1.5 hours.
She was pretty happy to go down for her first nap. With her, and most babies, they get stuck in this rut of habits. Since babies are creatures of habits, they really do love the routine of their morning. Mine LOVES going to sleep in the morning. Goodness, I can't take her out in the car bc she'll just konk out in the car on the way home.
My lo was going through teething, for some time and this probably resulted in the low A times. As the weeks went on, her A time in the afternoon was getting high. It was a hit and miss but towards the 11 -11.5 month mark she would start to just sing in her crib and not go to sleep for, sometimes, 15-20 minutes.
So at 10.5 months...I can't remember but I was doing 3-3.5 hours for the first A, second A was nearly 4 hours and this gave me a 45 minute nap and then 3.5 hours to bed..which she could handle. Then by 11.5 months, things were not working and she was giving me crazy EWs that were just so unlike her. I realized the last nap was interfering with her sleep ...but..that's for another day

I wish I had advice. However, it does take a week or two for some los to adapt. I -think- he's UT, carrie. I've always suspected that...but not sure how to proceed. Have you tried 4 hours of A time ?
*hugs*