You could always go get a radiator cleaning kit with the"T" that bolts into the heater lines and hooks up to the garden hose, has the yellow funnel thingy that hooks into the radiator cap location, and speed the water out of it.
Also I suspect your electric fans are not cutting it.
Recently I measured the air speed my stock mechanical 7 blade fan makes at about 2000 rpm and it was about 45 to 50 MPH
I am going to buy that radiator cleaning kit it really helps when bleeding the radiator and about the fan you have any brands you’d recommend cause that and the radiator is something I was planning on upgrading