Low KPI for BTS with remote RU

[Lampas]

Hello,

Can anybody give me a hand?
I have the following issue. In the network almost all of BTS with optical feeder have low KPI, such as CSSR, drop, SDCCH drop, but another sites (fider) have much better KPI. Vendor is E******* 6000 series.
The sites with feeder have higher SS for both directions UL/DL.
Also, we don't use TMA.

Should we define diffrent parameters for both these types?

Thanx