I've never tried this, but the recipe's name of "grainmax" suggests that it might be what you're looking for. It even simplifies things by being a monobath, so you don't even have the fuss of fixing afterwards!
http://www.digitaltruth.com/data/calba.php
(In case the link doesn't work, here's the recipe copy-pasted)
Calba's Grain Maximizing Monobath
Monobath formula for maximum grain
Stock Solution A
Water (45C) 700 ml
Metol 2 g
Sodium Sulfite (anhydrous) 50 g
Hydroquinone 20 g
Sodium Hydroxide 10 g
Potassium Bromide 2g
Stock Solution B
Water (25C) 300 ml
Chrome Alum (optional) 20 g
Sodium Thiosulfate 70g
Mixing instructions: Add chemicals in specified sequence. Always use cold water when mixing potassium or sodium hydroxide due to risk of heat reaction. In this case, reduce the original amount of hot water to 600 ml, and add the Sodium Hydroxide to 100ml of cold water prior to adding to Solution A.
Dilution: Mix both solutions together to make 1L just before use.
Starting point development time: 5-7 mins at 30C
Notes: This is a monobath formula, so no fixing is required! Chrome Alum is not required with modern emulsions. As with any monobath formula, results can vary greatly depending on film type, and there is a risk of fog/staining, so you are advised to run a test roll before processing any important negatives.