I use to limit going out to 63-68 about 7 miles off Ashtabula. I am now comfortable at 72 FOW. constant 2 footers are also within my comfort level.
No I will not be going out to 15 miles at all. the first time I went out on lake Erie I went out 300 yards and came back in nervous even that was beyond my comfort level. all the walleye have been on the bottom all of September. yellow has been the best color for me. there are very few fish on fish finder at any depth.