I agree that you can increase concentration (25mlA+25mlB per litre plus half a litre old brown). Also I don't bother with filters on the fomatone (that's another stop of exposure lost). I use times of around 1-1.5 minutes at f8 or so for 9x12 paper. I also up the temperature to 26 degrees+. With LD20 I would be snatching at around 5-6 minutes.