I suspect, Jeff, that I probably have played more rounds in 2019 than you have in total since you redesigned GSW back in the 1990s!
Come out to Gentle Creek some time and I will show you divot fields on most holes, both in fairways and around greens (I hazard to guess how many CBs we have, but likely over 100). 5% grade? Hah, some look like retaining walls! The members generally believe that the course drains well, I think because they let carts out earlier than most places.
As to the course in east Texas I was referring to, it is Pine Dunes, an outstanding design that suffers, IMO, from its remote location and area demographics. I am always careful to note area rainfall and conditions of other courses (your new one out there, for example, was firmer) played around that time.
I do wonder whether the perforated pipe can become plugged rather easily by soil, sand, silt, etc., and how hard it is to keep open to do its work. We have a CB and a bunker at GC which seem to hold water regularly despite the drainage being dug up and pipes snaked- perhaps there is not enough slope to the creek they feed into? We have seen tree roots poking out of pipes at the outlet, which is another problem all together.