Seamus,
I agree with you that from your location at the extreme south of Coventry at peak time you may just be quicker. At others I doubt it.
I live North Coventry and get to work at BHX in 20 mins at rush hour and 14 mins at other times, (Record 11mins
). Thats door to door. I also have three different routes I can take. When I lived south Coventry. Toll bar area the journey times were 30mins peak and 20 mins others.
Theres no way I would want to tackle Toll Bar island at rush hour.
The transport problems are a national one. Not necessarily any fault of either airport.
By the way, I also like Luton. I also find EMA good to get through.