…ugh, I enabled B3 and B20 again…and now got a speedtest with 48/20 
Only thing I see is, that CA still only is on B3, but primary is now the 10MHz phys-cellid and CA the 20MHz one…
that is actually well in the range of what I can expect here in my cell…anyone knows how to make that stable (if this is of any relevance at all).