Hi, I've attached two images from the same negative showing one printed from a professional lab and the other by me. I'm struggling with short exposure times and flat dark images. I'm using a Durst M605 diffuser enlarger with a GE EKG 80W 19V bulb. My print was enlarged at f11 for 5 seconds while using a Ilford Multigrade #4 filter. I'm guessing 3 or 4 seconds would have been a better exposure time but I thought that was quite short especially with a filter already in place. Do extremely short exposure times impact contrast? Thanks for any tips you might be able to share.