Sorry for the long delay. It's still holding up fine. I actually bought another one to cover the pool completely, but won't mount it until sometime this winter. Too cold out and all, it's getting into the low 70s and that's just too chilly to be outside.
Anyway, I guess the only thing I would do differently is pay more attention to the clamps on the wire rope. There's a right, a wrong way and my way, which is basically the wrong way, but faster. Do it once, do it right, or maybe more.
While the guy wire setup is pretty, it won't really work for you since your neighbors probably don't want that running into their backyard. Amazon sells an electric post hole digger but given the boulders in most of our soil here, I question its usefulness.
I guess the only thing I would consider doing different would be building a full frame to support the sail from all sides, like you see at city parks. That means busting out the large radius bender and rolling 20 foot sticks of 2x2 until my arms fall off, then welding the hole thing together and that's just not worth it. I don't live in an HOA, but I think the city might notice me erecting a full on structure back there.
BTW, just in case anyone is wondering, the footer for a cinder block wall is supposed to be 36 inches deep and there is supposed to be rebar running from the top block to two feet below surface. Roughly. I am not in the least concerned about a column falling. Now, the wall blocks fall if you stare at them funny, but you don't attach to those.
In thinking about your specific problem, I would place posts on the cinder block posts that are 3-4 inches above the fence height. Then weld (or bolt) a cross bar for the 35 feet of area you hope to cover. The eyebolts would attach to that cross bar so that you were not limited in where you could place them. If you just have the posts, you will have to have some odd spreads on the wire rope.
Also, while I would be concerned about mounting into fascia boards, if you use 3-4 inch lag screws and go into the rafters, it's not going anywhere. If you do have to mount into fascia, I'd run a backer lagged in on both sides and make sure you get into the backer, preferably through, with an eye bolt and washers, not a screw.
Finally, don't use the nylon rope that comes with the sails. Mine were the same brand as Dirk's, but I bought one at Home Depot and the second from Amazon. One was substantially cheaper. I also don't see the need for ninja stainless sailboat hardware. The normal zinc coated stuff has held up fine for years now.