Straight lining is far more often a case of not having enough toe-in. The inner fin actually works against the turn but you only notice this in the turning behaviour when the outer fin (that was helping the turn) leaves the water. Big and/or stiff fins by itself will only make it harder to turn but will not work against the turn, providing the toe-in is correct. Bigger and/or stiffer fins will off course make a wrong toe-in even worse.Aardvark wrote: ↑Tue Feb 11, 2020 8:36 pmSorry I didn't explain myself I meant that too big and/or stiff fins will lead to a lot of straight lining when bottom turning.
The difference can be quite profound.
It could be of influence here but, as riding speeds in on shore are lower, probably not that much. Fin forces increase exponentially with the speed.