Raising EUB bridge for better Arco or more authentic DB feel - Warning
I did raise my bridge and I did get a much better DB feel and sound. Arco was much improved.
At the first rehearsal for a community band I am playing with I bought my EUB along instead of my double bass, mainly because I wasn't sure of parking, access etc. it was an NS NXT if you are wondering.
At the end of the session my arm felt very tired as you might expect. What I didn't expect was intense muscle pain through my left arm and hand the next day. This is pain I hadn't experienced even with the full double bass. Over exertion? Definitely. The warning involves the why.
When you play the double bass and you pull on strings with your left hand you are doing more of a full body thing. Large muscle groups in your back/ shoulders combine with arm muscles to depress the string against the finger board. Technically, you actually don't need the thumb, well you sort of do but it's role is more like a bit player in the whole process.
When you play an EUB there is nothing to pull back against, meaning that the whole string depression against the fingerboard action is confined to the left hand only, and the thumb plays a major role.
If your action is raised, that then places a massive strain on the left hand, which is now doing all the work.
My advice is to think twice (or more lol) before playing extended sessions with the action raised on an EUB. Long term I think you are asking for trouble.