RE: F 161 and fin
Roger Jackson has posted instructions on how to do this in other posts. I'll let his words speak to the 'how.'
Yes, you can take a sanding block and put a flat (better still a tiny radius) on the traling edge and tip of your formula fin without affecting the performance of the fin to a degree you will be able to tell.
We've been "blunting" the TE of fins that "whistle" for years with no affect on the performance.
Run the sanding block (with 240 or 320 grit abrasve paper) down the TE of the fin with the block perpendicular to the fore and aft axis of the fin. 2-4 passes down the fin will take the sharp edge off. Then turn your sanding block to a 45 deg. angle and "break" the sharp edge where the tiny flat meets the foil of the fin. Just once or twice down the fin and you will have a nice 45 deg. chamfer that won't cut you if you happen to rub your leg or arm against it.
Starboard [Gemini, F-Type 148, iSonic 105], AHD [Convert 60, GT Special 73], Windsurfer
Neil Pryde [v8 9.8], Sailworks [Retro 8.0; Hucker 6.6, 5.6, 4.8]
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