next size up from severne blade 5.3

[aunty jack]

Hi I've got 2011 blades in 4.2 4.7 5.3 and want to get a bigger sail for the lighter days 14 to 18knts to use with an 90 litre wave board in onshore conditions. I'm 84kg
I recently tried a friends 2012 5.7m blade and going from my 5.3 to the 5.7 didn't seem to feel like much of a jump in size. I'm not sure what to get I was thinking of a 5.9 S1 or 6.0 Gator The jump from 5.3 to a 6.2 blade seems to big.
Any recommendations would be greatly appreciated.