If there isnt a fighter already waiting up there, the mossie is impossible to intercept if hes coming at 15k+, what is an amazingly long ~7 mins climb with the full bombload.
This might deserve a perk cost.
7 minutes climb without WEP.
With WEP, 50% fuel (over 30 minutes), 4000+2*500 lbs bombs, it will do ~2700 fpm... that is better than some US fighters in clean configuration.