Like slsurf, I find that a guild factor of 1.2 is the sweet spot for me.
More and I get the "rolling log effect".
Less and the board becomes noticeably slower to paddle (the board is sunk and displaces a lot of water), plus there is no real "resting" position and I must always actively keep the balance, so I get tired very fast.
But you must also factor in the width:
- a wider board can avoid the "log effect" and allow bigger volumes. E.g. 130L would be too much volume for a 29" board for me, but would be OK for a 31" one.
- wider boards add stability and compensate for the low volume. My 105L 7'3" Gong Fatal at 29"3/4 is as stabler for me as my 120L Gong Alley 8'1" also at 29"3/4, but with a wider plan shape, especially at the nose (2" and 1" more at the one foot offs). But the Alley paddles much faster, so I use it for more than shoulder high conditions, when waves can peak all over the place.
But to answer your original question, I have my "pointy shape" (the Alley) in two sizes: 105L and 120L for my 97kg. 80% of the time I use the 120L, the 105L is for very clean conditions and no crowds, when I know I would have a very high wave count, and would be OK to have a session of at most 1h30 before being too tired. But this is because they are very light (5.8kg with pad for the 120L, 5.2 for the 105L), so the "high volume" 120L is not so cumbersome on the wave because it is so light: you get the volume "for free", basically.
PS: You can see my quiver at
www.seabreeze.com.au/forums/Stand-Up-Paddle/SUP/Quobba-Fins-?page=8#2706724