Thank you, but - if you read in my post "... gives only a low volume tone, no matter if I play on the "real" PU's, or on any of the simulated ones" you see that the low volume happens with the magnetics AND the simulations.
During "normal" playing this can be minimized by digging in a bit more, but while playing slide (main form), then it becomes even more troublesome. Even the use of a compressor (++ sustain) does near to nothing to enhance the volume/sustain of the high E.
Today I changed to the NYXL strings from D'addario. They deliver more output, especially in the higher register - still the high E "stands out"/is lower in volume, has less sustain then normal.
So I looked for bridge replacements and found that Line6 has them but only delivers to customers in the USA?