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Surfnbjj said..
The Starboard felt much more "stuck" to the wave, harder to initiate a pumping action.
That's what both the reduction in volume and a "performance" (aka shortboard) rocker will do, compared to the performer that can generate speed by itself. You will have to learn to generate speed yourself.
Basically, longboard shape generate speed for you, but will need more pilot action to turn.
shortboard shapes turn very easily, but the pilot will have to get them up to speed.
Or: there is no free lunch, everything is a compromise :-)
Also, contest surfing on shortboards is done being "late" relative to the curl and always playing catchup with it to place the rollers in the most critical part of it. Longboard shapes, with their speed will tend to glide too far on the shoulder for scoring in contests. But for recreational use, everything works.
You can look at YouTube videos on how to generate speed with shortboards, the same applies to SUPs. E.g:
PS: on fins, the quobba will help you a lot by raising the maximum speed of the board, but not really to start the pumping action at low speed. Once you know how to pump, the Quobba work quite well, but when you are learning how to pump, I think C-Drives could be more helpful as they provide a lot of grip at low speed, and thus help generate speed in the initial turns if your technique is not yet honed. Quobba at low speed will feel like normal fins for you at your level. Once you know how to generate speed, the C-Drive "speed limit" (similar to normal fins) will justify switching to Quobba.
If you can afford only one set of fins, I would favor the Quobba, but C-Drive is also a good (but different) choice. And fins resell easily.