average amount of weight needed for dives with 7mm suit

[Granitehawk]

I am 6' 2,  290, and need 28# with my 6.5 Farmer john suit, 18 with a full 3mm, and 12 with a 3mm shorty. i have used ankle weights with no notice able affect on my diving, just helped to lower legs.

My dive buddy is 5' 8,  220 and use on average 4-6  lbs less for same suits

but i use 1/4 less air

My point is like i seen some on  here say experiment and find your ideal level