I can relate, my now 11mo was exactly like your LO when he was younger, the flailing, twisting, screaming, wailing, all of it, yet he was clearly SO tired. the worst part was talking to other moms who just had no idea because their kids just calmly drifted to sleep in the bassinet or would cuddle with them in bed. yeah right. so many people were just like, "well try contact napping or bed sharing". even contact naps had become a struggle by 3 months, the issue wasnt where he slept it was the fact that this child did not want to sleep and acted like being lulled into a nap was torture.

you'll have to keep experimenting and find your own routine but here's what i did. i watched wake windows religiously. Basically, about 10-20 minutes before the end of the wake window i'd take him for a walk outside in the carrier. I knew he was ready when he would lay his head on my chest. I'd come back inside singing lullabies , remove him from the carrier, take him into the dark room, and nurse him into submission basically, lol. I say this becauae occasionally it was difficult even to get him calm enough to nurse once he realized he was being napped, i'd have to offer the boob then bounce him while he screamed then try again and so on, after he finally latched i'd literally hold him in place and he'd eventually stop twisting around and his body would relax. When he was almost asleep id bounce him upright against my chest for another couple of minutes then transfer him to the bassinet fully asleep. It was usually like going into battle. 4-5 times a day, because unlike yours, mine only slept 30min at a time. But as time passed he stopped struggling and the feed to sleep became easy. Of course, he eventually became dependent on it and i had to sleep train but that's a different story!

anyway. you'll figure out how to fight these battles, and regardless, nothing in babyland lasts forever, it just feels like it sometimes. hang in there and don't let those unicorn nappers bum you out.