I am referring to the 1 46 springs that trick flow spec'd on their heads, which have 120lbs seat pressure and 300? at maximum lift. These particular springs are probably not what your "couple of guys" are running with their solid rollers
Point I was making is that 1.46 springs are available that can handle a lot of pressure. Not sure if you knew that.
Rod Bloomer has used
them for mechanical roller setups( the ones I referred to)