Is there a website where we can check the thickness of the many strings? The same way that we can check tension, etc.
I've been using Titanium Solo, I really like them, except the fact that they're thinner, because I don't have large hands it makes it harder for me to play 5ths.
Very few brands state the diameter-some gut string makers do.
Adjusting distances between strings would solve your problem. A new nut and bridge with slightly smaller distances between string grooves need to be done (by a luthier of course). The string distances are not perfectly standardized. Firstly, a good luthier takes the increasing gauge from E to G (when dividing the whole range into three spaces) into consideration. Secondly, the spaces may be done slightly narrower or wider according to a customer's fingers and taste.