Sorry, APOP is accidental parenting on purpose. So knowingly using a prop to get your Lo to sleep. With both my kids, this would usually be a car ride or a walk in the stroller. I'm glad Friday and Saturday were good.
Here is the average amounts of day and night time sleep by age.
Typical Amounts of Day and Night Sleep.
You probably know how much DT sleep he needs based on his behaviour. I'd agree that 1 hr 35 is not enough though.
So he's rolling onto his tummy? I'm assume that he's not swaddled. If he is, then it's time to take his arms out. Rolling in their sleep can cause nw's. like other milestones, they will usually practice in their sleep and often wake up for it. Give him lots of opportunity to practice during the day so he doesn't need to practice in his sleep!
Wrt tummy sleeping, yes, it's a sids risk but if they are able to roll themselves, then this is generally alright. In the long run, you may not be able to prevent him from tummy sleeping but once he has the rolling skill down pat, I'd be less concerned (my dd tummy sleeps. I always put her on her back but as soon as she's in her crib, she's rolling over).
Wrt to A times, it looks like you are around 2 hrs. Given the rolling at night/disrupted sleep, I'd hold his As for a week or so and once his nt sleep improves, then try a slightly longer A. I agree, it's hard when their As change all the time especially if you have stuff scheduled. Try to go with the flow....