I'm not really offering any advice, just thinking out loud.
I've had/have some seriously heavy match rifles, one was just short of 20lbs and the other just short of 24 lbs.
Being a shortish and oldish guy, they are too heavy for positional for me, especially offhand, not too mention a bitch to haul around all day when considering the other gear one has to carry. Fatigue really sets in for me towards the end of the day.
What the heavy rifle excels at is they have less recoil upset which helps with self spotting, typically balance better or with a slightly forward bias, and they'll sit on a bag off an obstacle much steadier than a lighter rifle!
I just got a medium weight 6mmBR barrel for what was the 20lb rifle and put a lighter scope on it. I haven't weighed it but it's around 15 lbs now. I can hit stuff offhand again, lol - yay, I hit a 7" diamond 3 times in a row at 289Y two weeks ago which would have been impossible before! But the rifle doesn't sit as steady off a bag on an obstacle like it did beforehand.
I've been pondering detachable lead weight systems, and throwing overboard the non essentials out of my pack, heck even my pack without anything in it is too heavy so it might need to go. My chassis is an odd one so it's going to be a total custom proposition figuring how to go about it.