Hi Capegirl. Welcome to the boards.
Yes, I had one who SCREAMED at all sleep times. For like 20 minutes every time until around 6 weeks.
When we sorted out A times and started sleep training with shh/pat it got better in a hurry, but boy it was hard, and I thought it would always be that way!
Your A times seem good, we were doing around 45 minutes at that age.
Do you think he could be a bit more aware of his surroundings now and getting overstimulated? Bouncing can be overstimulating to babies, especially spirited ones. Bouncing can also aggravate reflux. Tracy recommends holding a very young baby still during wind down, in addition to darkening the room, swaddling, and using a shhh/shhh noise to calm them if they cry. (The "Four S" routine.)
My dd did have mild reflux and she seemed fine during changing, A time, baths, etc. It was just during feeds and at night when it was a problem. Fortunately she outgrew it around 4.5 months. Inclining the mattress did help (although she often ended up in a pile at the bottom), as well as holding upright for a while after feeds. Most babies spit up though, it doesn't always mean reflux.
RE: pu/pd, if your lo gets really worked up during pat/shush, you can pick up and comfort, but then put back down and try to continue calming in the crib. It's just *repeated* picking up/putting down that's not recommend for such a young lo, as that can be overstimulating. My lo is almost 6 months and still can't handle repeated picking up/putting down.
HTH!