Having RSI(too many years of IT
), I tried using a 630mm/49.5mm nut/slim neck/low tension romantic guitar copy (a copy of a panormo).
As a that time I had a flamenca (as a loan) from the same builder,I compared the thinner neck profile to my main guitar (made it really easy to play,but the Panormo was the king due to the scale and the low tension)
Of the 3 the panormo had the thinnest neck (21mm thickness on the 1st fret, like a "señorita" model), the neck/shorterscale made many pieces easier to play but the narrower fretboard made some positions feel "cramped" (
I initially struggle with some low positions chords,as the space was not wide enough).
Little by little I got used to it, sold my normal 650mm and ordered a concierto in 630mm, 51mm(a bit bigger!) nut and 21 mm at the 1st fret.
I never looked back to 650mm,as my RSI seems to be under control using 630mm and the sonic result was very pleasant (still the builder advised me not to go for a huge Madrid Style body but a 485mm x 100mm "normal body" as he believed the bass/trebles would be more balanced)