Easton lightspeed 500 are 6.5gr per inch
Easton lightspeed 400 are 7.4gr per inch
Easton Fatboy 500 are 7.1gr per inch
Easton Fatboy 400 are 7.8gr per inch
Radial X-Weave Pro 100 are 6.6gr per inch
Radial X-Weave Pro 200 are 7.5gr per inch
All are great shafts just make sure you stay above the minimum of 5gr per pound.
Good luck my friend with whatever you decide.