Towards the end, the undulations were, indeed, quite bad.
I had one particular horse who used to belt the shit out of his hocks whenever he raced there, you could see his action go to pieces when in the straight. OK, only one horse from a small team...but he never touched any other time, whether in work or on another racetrack, and he had quite a few starts.
There were quite a lot of conflicting opinions on how to remedy said problem, one from one of the senior course workers - a very experienced guy - he reckoned the best and most cost effective option would have been to have removed the grass layer, graded the thing level, and replaced with new turf.