I wouldn't put a concave lip on it. As there is no gradated down section. The 30 odd degree consistent take off, leaves the car flatter coming down. With a lip, it will send the cars north and make the impact heavier. Stationary cars waiting to find traction will lead to vertical stacking
I am surprised to see the worn marks as the last meeting was on Sunday, the day before the Boughton regional, and I don't know anyone that raced (not saying there wasn't, just I don't know of anyone that had the balls to go racing on Easter Sunday AND Monday).
Regarding the jumps at the back - I agree with Mr Evans (take a picture people, this is rare), it will need some TLC. This much rain and it will be like jumping through mashed potatoe.
East of England - Renowned for it's low rainful, currently in a state of drought and yet it is likely to p'+s it down for 3 out of 3 meetings. Unbelievable! On a positive note - it's not like the weather has crept up on us - at least it's had the good nature to advertise the fact well in advance.
Looking forward to Sunday. After my wins in all 3 classes at round 2 (FACT -it's on oOple) I have some titles to win!