Help please! Forceful Let-down causing chaos

[HousePlantMama]

Hi all. First time poster and flustered FTM so all advice welcome.

I am struggling with forceful let down/oversupply causing my 4-week old to vomit a lot, struggle to get to sleep and have lots of pain/congestion/wind.

We struggled to get breastfeeding established (lower birth weight, traumatic birth, tongue tie) but persevered and since had tie snipped which has really improved latch.

LO now goes 10-15min on one breast (often coughing, gulping, spluttering) and we both end-up covered in milk.

He'll then happily doze off upright on my shoulder (after a few spit ups) but then is awake straight away when l lay him flat (and will often vomit). He then shouts and fusses and takes ages to fall asleep (on me) again, to only wake up 30-mins later to feed (I know he's getting enough as he's put on 15 ounces in two weeks!).

Most days he is overtired and asking to feed every hour.

I've read Kelly Mums advice and I'm already essentially doing blocked feeding as he doesn't need to go on to the other breast each feed.

I'm trying 'uphill feeding' but tricky as I have size GG breasts and have to help him with the weight of my breasts, otherwise he loses the latch.

I presume my milk supply will steady itself in due course but for now I my questions are;

Should I attempt to space out feedings more to 2/3 hours? If so, any advice how?

How can I help him sleep better after feeds? Anything for a bit of shoulder rest!

Would napping in bouncy chair or similar help?

Will other feeding positions help? Anything else to try?

Sorry for long post and thanks in advance!

Don't try to space out feeding. His stomach is tiny, BM is easily digested and it's comfort as well. Catch let down in a muslin if needs be. The idea that BF babies don't need winding is BS. THey do unless it's all perfect with latch etc- we struggled with it and needed to use infacol until DS was about 6 weeks. He is still establishing BF so does need to feed often to get your supply sorted and there is a growth spurt around 6 weeks.

Also very normal behaviour re sleeping- I rarely put DS down at all during the first 3 months. DH had him for a few hours evening bar milk and for a couple of hours in the morning and doing dog walk so I got enough sleep in those 2 chunks. Perhaps worth reading up on 4th trimester. Do you have a sling or carrier to pop him into and stay upright.

I also have forceful letdown, sometimes I have to wait for it to come and then let it squirt(?) into a muslin. Its like a jet so I can see why DS struggles with it. Then I pop him back on and hes fine, definitely needs burping as hes quite dramatic the way he guzzles...
Also have massive boobs and I found once he got to about 6/7 weeks lying on the sofa slightly propped up on some pillows and then ds lay below me and I would drop my boob into his mouth so he was still kind of upright (also hates lying flat). It will get easier as head control gets better :)