FTP= Functional Threshold Power.
Have you done any wattage tests? 20 min?
I'm thinking weight is your #1 limiter. Running may actually help you lose weight faster.
I know climbing is your weak area, but you don't need to go out and just climb to improve that. You really need to improve your power/weight ratio, and improving your power with intervals on the trainer or losing weight will do the trick. Big guys don't climb fast. Don't expect to climb fast with that body type without major weight loss. Concentrate on flatter races, with maybe rolly hills, not with long climbs where you lose momentum from straightaways and descents.