Additional Down fill

[Old Man]

in the top and underquilt how much additional 900 down filing do you use before it becomes overkill?

[BigTurtle]

well it depends on what size of a quilt what the loft is but as a rule of thumb you can go 20% over the factory fill and should be ok but again depends on the quilt a thicker quilt is more forgiving than a thinner one

[te-wa]

i agree, 20%
if you crunch the numbers, both the HG Phoenix and the te-wa Freeze sit around 19.5% overfill.
the Flamethrower looks about ~25%