Eastchurch would be a great airfield to use, but ATAG's maps limit it to Blenheim air starts for some reason. I say open it up to player choice of aircraft and code and a lot of people would use it.
Is it one of the bugged airfields for spawns? Maybe that's the reason.
Maidstone is...bumpy. It's difficult to get up there (not impossible). Inexperienced pilots might have a very hard time taking off from Maidstone.
Also, with regard to the 109s taking out low and slow aircraft just after take-off: try this
If you're in a hurricane, drop your flaps a bit and weave at the slowest speed you can manage and still make it look like you're not about to stall. If you do it right, and the attacker isn't wise to it, he'll stall right into the ground. It'll work in a Spit too, just be careful not to damage the flaps at speed.
I've done this successfully on three occasions and it's very satisfying
