1:1.5 to 1:2 ketone/amine will work fine. the more amine the better, but you should be able to get decent ok yields even with the lower ratio as long as you limit amine losses (cold water through condenser, not running it too hot, sheet Al, taking your time etc).
When you already have the amine (not nitroethane) and use thick Al then you will need less than 80g Al/mol ketone. About 50-60g Al/mol ketone should be sufficient.
I'm not fat just horizontally disproportionate.