TR is exponentially more difficult for a 90 shooter than a 76. There just seem to be issues for the poorer player that are just interesting curiosities for the better player.
Why? Because you just described the very essence of high slope, low CR. I'm just trying to get a handle on exactly what features cause this to be so.
Well, part of the problem is those sandy areas whose difficulty I just got done minimizing! Some of the area generally is fine and easily playable, other parts are pretty gnarly. It's hit or miss.
Also, and this is just from what I witnessed from playing there with a 90 shooter, where I may not have had much problem playing from the cleaner areas, my 90 friend was far more intimidated just because he was "in the sand". The fact that it was hard-packed and a clean lie did not seem to help him much.
Second issue for the 90 guy--the large, pronounced slopes in the greens. For a decent player with a wedge or 8 iron in hand, it is often difficult to help but hit it within 30 feet or less because of the backstops/collecting slopes. But for my friend, hitting more club (he is shorter off tee AND with his irons), he is hitting a 5 iron perhaps and he will be on the wrong side of those same slopes. He then will have a very dicey putt, difficulty judging speed and line being made much tougher having to traverse the big slopes.
An example (which I know won't mean much to you). #7, with the pin front left. If I have hit the huge fairway, I will have a wedge to a pin backed up by a giant hill. Really, even if I hit a wedge 10 yards too long, I will still spin back and at worst have 30 feet. My friend with his 6 iron may easily end up either too far right or long and have a very hard 2 putt.
Second example, the next hole, a par 3 around 175. The green is segmented into three distinct mini-greens. I have a decent chance of hitting my 6 iron to the correct area and then having a flattish putt. My friend, hitting a 5 wood or whatnot does not, and if he hits the green will have serious swale-idge to deal with. And if he misses the green (not unlikely with a 5 wood), he will have a tough up and down.
Another issue is intimidation. The very first tee shot can be very hard or very easy. For my friend, he knows he needs to hit his best to get past the two mountains. I know can hit it just ok and be out there in the wide fairway past the trouble. So he presses a little and, well, you know the result of that.
Fourth issue is the ability to hit the ball on the high side. There are many places where it is far easier to get where you want to be by hitting a high soft shot. My 90 friend, who hits it lower, has a much tougher time accessing certains areas of greens, and a lower shot may find the green but then have to deal with those big slopes, or worse, find some of the gnarliness off the green. (But, it should be said, there is almost always a way to get from here to there without traversing the ugliness, at the cost of a stroke)
Fifth, the ability to play from greenside bunkers. Many of these will be found by the 90 man, and though they do not play as hard as they sometimes appear, the reality is our 90 guy will miss some of these, sometimes several times on the same hole, and some of these bunker shots, truth be told, are not convential or something he has seen before.
Sixth, and this may be a stretch--I wonder if the 90 guy generally has the mental strength to 'carry on' when he hits it in one of the weird places, as it may be easier for him to be overwhelmed? As opposed to the better player who may look at it as an opportunity, or at least may think it is a rarity.