Hi Sam, Bullseye, and all,
First, I just quickly want to clarify that I'm in no way attempting to complain about any aspect of the BSF or the layout.

I had a phenomenal time playing my first BSF, and both courses are absolutely top-notch.. by far the most impressive courses I've ever played. I dearly wish Milo wasn't a 2.5 hour drive for me.. I'd be there much more. :P
For the Genius Hole (E9), as this was also my first time ever playing the courses, I didn't know about the tree opening up the 'fairway'. I agree with Bullseye in that it really can't be fixed by just reducing it to a par 3. As I recall, there's a very large fir tree to the right of the BSF basket placement. Would it be possible to place the basket off to the right of that tree somewhere more protected? I really feel like with more protection around the basket the hole would be a legitimate par 4.
For E13, the whole point of this exercise is to not debate "is it 2-able?". Sure, you can get a 2 on E13. But out of 163 recorded rounds, only 10 people actually accomplished that. Be it flight path, distance, landing placement, etc., in the BSF configuration this hole is still not producing the desired scoring spread. Honestly, I don't really have a great solution for it, either.. there aren't a lot of (other) good basket placement options for it. Perhaps long-term a different tee pad location could help?
For W8, I definitely liked the island position, and I'm not sure what other basket placements might really be good options. That said, I'm not a huge fan of artificial 'hay bale' obstacles either. Are there really no good options on the left side (heading toward the next tee pad)?
For W18, it really felt like there should have been a viable 'shortcut' route. If you examine the hole diagram in the caddy book/tee sign for this hole, you can easily see where I mean. There's that tiny strip of fairway just short of the two trees. But that line wasn't actually there on the hole itself. Perhaps that could be cleared out slightly, to allow for a dialed-in shorter drive for a window at the basket?
I also probably should have mentioned W10 as another with redesign potential (76.7% of players put up 3s on it). I recall that the lower branches of some of the fir tree guarding the basket were already cleared, so that pretty much just leaves moving the basket slightly to allow for more birdie lines. No real suggestion here.