It is almost 2 weeks since i have posted above query. Lot happened since than.... few nights in darkroom... lots of precious paper burnt for a good cause. The results are quite disappointing. Forte polygrade V paper's contrast range does not go beyond Grade 2 on my Durst M605 enlarger with colour head. This is a real problem as i print most of my negatives in the range of 2.5 to 3. Ilford MG4 FB barely goes up to grade 3. I am not able to figure out what i am doing wrong. Is there a chance that enlarger dichroic filters faded in my 10 years old enlarger? if this is the case can these filters be changed?