I am on an iMac running Mojave. Since I am a graphic artist, I create large Illustrator files that need to be converted to PDFs and emailed for proofing. However, when the files are optimized through Adobe Acrobat Pro DC, the resulting PDF has numerous white lines running through it. I would like to see a quick, efficient way to reduce files that are around 100mgs and still be sharp, clean files with no lines. I understand that they don't print, but my clients always question them and are skeptical when I try to explain that the lines won't print. Please help! I have tried EVERYTHING and the minute I get the file small enough to email (10 - 13mgs) the lines come back.