The vintage pro t-bird is a great bass - I currently have two of 'em, both sunburst although I think I'd quite like one of the white ones. I love the slim neck & the mighty tone they puts out.
I also have a natural wax-finish pro-v five string epi t-bird, but although the neck is quite shallow front to back it is massively wide, and although it has active eq, the vintage pro beats it hands down on sound.
The pickups in your pro-iv look rather rather unusual - what are they?