I just fixed the net on return of serve at 2/2 30-0 of "2014-02-04.00-18 - Tired vs SERBI 6-3.dmo" .
Actually, the calculation for the net clearance height was extremely simple, so I re-did it way more accurately and now all of this kind of balls should have at least 10-20cm of clearance, meaning the net balls will greatly decrease in TE2013 v1.0d (coming within a week).