There is nothing wrong with the string winding going around the tuning posts on a P-Bass with those strings. They are large diameter tuning posts and the strings are more than flexible enough.
You want Long Scale strings. If you dont want any winding around the post get ones that are 36.5" winding length. 37" will bring the winding right up next to the post.
With the Rotos you will want Long Scale: RS66LD is their most popular set .045 .065 .080 .105 but many others gauges are available.
I am not 100% sure of the winding length on the Blue Steels... Well actually now I am, I just measured one. Blue Steels are 37.5" from Ball End to Silk.
GHS for example has Long and Long+... Long = 36.5" winding length while Long+ is 38" winding length... Here is a photo of my Jazz bass with 38" winding length strings on it from GHS (Boomers):
Here is my old 73 P-Bass with Ken Smith Compressors which are 38" ball end to silk:
