I'm sure that this is a horse that has gotten a beating several times. But I'm extremely paranoid about this sort of thing. 
I play a Fender Deluxe Active Jazz® (MIM). Everything is stock. I want to go to D'Addario Chromes. (Since I started learning upright at school I have found that I prefer flats) I'm a little worried about string gauge and length. (And whatever else I'm not thinking about)
A few suggestions of what I'm looking for would be awesome, thanks!
Edit: I forgot to mention that the bass IS fretted. Not that it really matters.

I play a Fender Deluxe Active Jazz® (MIM). Everything is stock. I want to go to D'Addario Chromes. (Since I started learning upright at school I have found that I prefer flats) I'm a little worried about string gauge and length. (And whatever else I'm not thinking about)
A few suggestions of what I'm looking for would be awesome, thanks!Edit: I forgot to mention that the bass IS fretted. Not that it really matters.