Roller lifter min valve spring PSI

I run a Lunati solid roller and when I called their tech the fellow told me not to go by what was on the cam card. He described the spring pressure data on the card as the bare bones minimum but they would actually like to see more pressure. My card showed 210 and 556 pounds at 1.95" installed height but the tech people said that they actually want a minumum of 230 and 650... Personally I think they should put the range on the cards if that's the case. I bet a lot of people go by that data and run springs a bit lower in pressure thinking the card info gives the ideal pressures.