poor grinding efficiency of cement grinding

dear all,

my combicircuit mill is deteriorated from 270 tph to 230 tph along with reduction in fineness from 3500 to 3100 blaine.

ball mill inlet blaine 55 to 65 

ball mill outlet blaine 100 to 110

rolers seems to be okay 

gr. media is full

iaball mill is monochamber with 30mm to 15mm gr media

PPC	240 TPH
	BLAINE	2MM RETN	1MM RETN	0.5 MM RETN	212 MIC,.	90 MIC	45 MIC
BM INLET	59	0.18	0.9	5.8	18	30	32
BM OUTLET	107	0	0.4	4	15.6	27.4	29
FINES	312				0.1	1.3	11.2
DFA	226
PFA	126

separator checked inside . No much wear seen . above samples says deterioration in separator ?

please suggest .

regards

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