For my part, I make the EL kit, and I can get the EF kit, but it's more expensive and I can't offer the members' discount on the EF kit. the EL one is far more popular.
As for the rear skirt not fitting well, mine does, as long as you follow the fitting instructions. Where people come unstuck is they think they're too clever to stoop to reading the instructions, so they throw them away.
You must take the back bar off to fit the rear skirt properly. It just won't work trying to fit it on the car.
Cheers, Bob

this might be a little off topic,
but when changing the nose from stock EF to EL XR does the bonnet need to be changed too? and i need to change the lights

yes you need to change the lights.
you'll need to change the bonnet if you have a mont or lane.

Mate, wasn't bagging out your kit, was merely saying most of the aftermarket ones you see fitted have gaps.