Wow! That string calculator is brilliant! I shall definitely have a play around and see what I come up with thanks for your help!
Tension may differ slightly between different makes, but not dramatically. Feel and flexibility are different chapters. Feel is a matter of finish. Flexibility depends on construction. A while ago I published a video on how I restring a bass with flatwounds. I like them perfectly smooth, so I invest in a little extra work. Preparing strings