Fomabrom/variant takes a very long time in development. If you want faster development, you might try Foma warm tone papers. They are a bit speedier. Also, float your tray in a larger tray of very hot water. I try to start at 40C or so. A tray warmer also works, but electricity in my sink scares me.

I am very impatient (as lith printers go), but I never boost the dilution unless I am looking for more subtle colors.