I'm not very familiar with the upper Trent but I would go with a couple of pints and feed every chuck to average them out over five or six hours for the initial session, you'll then be able to gauge for following sessions whether you need to up it.
Whilst the river is low look for swims with a good flow or cover, even better both.
Don't be afraid to experiment with your shotting, eg use no.6's instead of no.4's for a slower drop or a bulk close to the hook with a single dropper if you need to peg it down in a faster swim and experiment with running it at 'em full pace or drag it through just on the bottom.
Eventually you will find the right combination and you should have some fun along the way