Sorry lots of random thoughts-
You'd better go have a look at your front suspension- do you have any shims left? Lotus did make different shim sizes but in general i think its .25* per shim assuming there's any in there. You may not be able to get more camber with your current setup.
Typically street tires don't like a ton of camber. Ever run with A048 or R888? I wonder if you're just over driving the tires you've got... RE71R I'm sure are great but wouldn't be surprised if they are like their RE-11 cousins, great cold, ok for a few laps, easily gets greasy.
You've described your track as bumpy, I would think harder sway bar may make problems worse.
Lotus tends to understeer in low speed corners, its a delicate balance as far as I can tell. You want to try and push weight up front initiating the turn, but
- too much and you exceed tire grip and slide
- too little and there isn't enough weight on the front end to make it bite
Just for reference sake (and I don't care about tire wear):
F: -1.9*, 0 toe, 125mm
R: -2.6*, 3mm total toe in, 130mm
OEM front swaybar on the middle setting (believe BWR sway bar is stiffer, not sure how lowest setting equates to stock bar)
Suggest posting that video in the track video thread, maybe others can comment. How much previous track experience do you have, and in what?
"Give a man a match, and he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life."