I’ve gone the heavy route and I’m going to cut it back when I run out of arrows. I’m shooting Victory VAPs that come out to around 550 grains with 240 grains upfront. I think for guys pulling 60-70 lb bows, 475 grains is a pretty good sweet spot. I’d shoot for anything in the 450-500 grain range but wouldn’t worry about foc. You’re going to give up arrow durability if you try to get a high foc and maintain a reasonable arrow weight. I’d steer clear of the FMJs too unless you want to build a really heavy arrow. I’ve never shot them but I prefer to have an arrow that won’t bend