Hi Cholo,
It's just a question of power you put in your legs to go fast, the SL2 need a bit more than the SL4.
Their is a lot of differents kind of fins on the market beacause some prefer power and other glider man, in this case the SL2 is more dedicace for people like power and SL4 glider man.
SL1 > SL2 > SL4 > SL3
For my iSonic I do like this :
iSonic 111 : SL4
iSonic 86 : SL3
All the best
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