Since I´ve two sets of FG-5, I tried a quad set with both side fins to see how it went. For sure the board got more stuck to the water. So, I bought a pair of center fins FCS H-3 Nexus from a friend which used with two FG-5 side fins, and I was able to try them today in offshore 1m waves. Now we´re having fun! I think the "real" quad set helped me getting used to the board. However, next time I want to use the FG-5 thruster set again. Will let you guys know. Thanks for all the advices.