So I took the 1200 grit Threshold to the same lanes, got the same condition and was surprised. AT 1200 grit I got almost the same reaction as I got from 800; not quite the same but almost. I've never seen a ball react so differently to such relatively small changes in the coverstock. At 2000 grit the ball was barely hooking until I went way out to the bone dry around 3/4 board. Today, it was hooking just on/outside the oil line (7/8 board), as I had expected it to last week. Very strange.
I would have expected such a difference between 600 grit and maybe 4000 grit, not between 800, 1200 and 2000 grit.
Nice thing was once it hit the dry, the ball never overreacted, but it was not a continuous hook/backend either. I tried 2 releases: my standard one and one with much more revs and more tilt. The 2nd one, of course, got a much more significant ball reaction and I had to stand 6/8 boards deeper.
A 2nd good thing was that because the ball didn't overeact, with my first release, and a tiny bit of added ball speed, I could play an outside line, standing 19/20, laying down around 12/13 at the foul line playing a breakpoint of around 3/4. This, I liked a lot. My normal line at this house is standing 25-30 (depending on the oil and the ball I have in hand) and sending it out to 7/8 at breakpoint.
One not so nice thing was once the ball sniffed dry, it made a quite sudden move but that may be more a result of the MB being 4" from my PAP. Pin is also at 4" but just outside the ring finger. This is a very strong drill for me. I did it because I haven't had a lot of luck with asymmetric balls.
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"None are so blind as those who will not see."