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Correct gauge for a C string

I just converted one of my 34" J 5 string basses to E to C. I have D'Addario Prosteels 105 to 45 on it. Currently I have a 28 on it. It works fine on my 6 string and my 35" scale E to C bass. But on the 34" J it might be a bit too twangy compared to the other strings. I can get the prosteel singles in 30 or 32. What would be the correct gauge tension wise?
 
Why not try both? I’d start with the 32 as that looks to be the “standard” C that D’Addario packages in their string sets. If it felt off, I’d try the 30 next.
 
30 is my go to.
Played 6ers for about 12 years. (35”)
Now I play only 5ers stung E to C.
(34” and 35”).
Even my lightest gauge instrument (Wooten DR’s) sports a Pure Blues C, .030.
 
28 seems like a big drop from 45 and would feel too light for my fingers. Between 30 and 32, whichever your ears and fingers like best is the "correct" one. Alternatively, neither is a wrong one. The only way you can be sure is to buy and try both.
 
Okay thank you guys. I've had the 28 on the bass and it actually blends surprisingly well with a 45 G string. That's with brand new prosteels.
I'm in a Latin jazz/world music group and I often play the role of the guitar player because we have tracks and there is bass going on behind me when I do that. So I don't need the C string to sound fat I need clarity.
I had 30s on my 35-in scale E to C bass. That felt too tight for me that's why I went to a 28. I should have kept the 30s. Now I have to buy one again. Not sure I can handle a huge expense like that LOL
I'll get another 30 just to see, but I do have a feeling that I might stay with the 28