i’m in Latvia..
and looks like you have very strong signal, but signal quality is so so.. SINR looks very bad.. do you have direct vision to the tower available?
in my country CA works only when you start utilizing connection.. so run speedtest, and you should see CA bands too.
B20 is useless, switch it off..
You can cell lock your primary band to B7, and then CA with B3. CA is always set by provider.
see here: http://forum.mikrotik.com/t/chateau-lte12-and-r11e-lte6-passthrough/138488/1