So, I'm strictly an amateur hobbyist. Worked with several supplies of D76 and ID11. Always found them to work well, but i wanted to try Xtol for it's alleged finer grain. I'm almost through my current supply, and again, not being an expert, I'm planning to go back to D76. I find Xtol at 1+1 to be a bit flat and lacks contrast. Can't imagine using it at 1+3. If any experts out there want to tell me what I'm doing wrong, is be happy to listen.