Yes I don't have a teal Bio 100 to test/compare with. Yes im using the SW calculator from TW and got 309 (consistently) now with leather and an over grip strung. If there is a difference then I don't think there could be that much of a difference. My green Bio 100 balance with the stock grip and factory strung was 12.45 in (316.23mm, 7.9HL). I'm thinking the green Bio 100 is identical to the 4D100. The specs of the teal Bio 100 is perfect for me to customize, if it wasn't for the nasty teal. I'm starting to feel the instability of my 4D100 hitting face pace balls now. It just feels a bit wobbly (366g at 7.75HL).