ok ok ok well "help" him. lolol
Anyway...
what your problem seems to be is that you simply enjoy the sound of a blues scale. Its very easy to finger out on a guitar and it can be used in many applications. i play guitar, not very well i may add. But i also do play keys. whenever i find myself using the same scale for alot of composition i literally force myself to jam in a completely different scale over and over and over again. Doing this has made me comfortable with the way i finger things and also has trained my ear to be satisfied with what i am playing or composing.
Every player has their comfort zone. im in an improv band (drummer) and i notice that whenever we stall a little and pick things back up all of a sudden everyone is playing A major and im playing my comfort beats on drums (hip hop, dub, dnb and house). I literally force myself to practice and play beats that i am not comfortable playing. later listening to the tracks i notice the staleness isnt there and it turns out to be some pretty sick stuff even though at the time it felt odd. it just seems that my band is comfortable with A major.....go figure.
So what i think you need to do is literally FORCE yourself to only play in scales that you are not used to.
Pick one or two scales and play them so much that they become second nature. The same way a blues scale is second nature. you will find you can stray from it and come back to it as easily as you do now with the blues scale
hope that answers your question and helps a bit.