Calculate TRIMMEAN with multiple conditions

I want to expand on the below formula, located @ RESULTS 1 Q3 in the attached WB. I want to add a couple conditions...

=TRIMMEAN(IF(Table1[MAX GAIN]>=4,Table1[POINTS G/L]),10%)

Add the following conditions...

IF Table1[EXIT REASON] = "5x20"
IF Table1[MAX GAIN] ">=4" counts >= 5