Been fishing upstream of Kaudyala last few years.
Big fish still in the Ganges though not as fiesty and tough as the Kali fish ...
Kali fish have balls !!!
Byasghat is good during the migration but its all about timing - the Nayar drops in less than 4-5 days and all the big bros have moved into the Ganges - the trick is to time it and be there on the confluence when the traffic is moving - thats the time to haul up in byasghat.
There are a few spots downriver below Kaudyala and Shivpuri where the rafting camps are - its a bit crowded for my personal scenery requirements but I know people who haul up here as well. The terrain is serious mahseer country but the rafting camps have pushed the fish out to quieter sections of the river.
It would make sense for guys coming from South to shack up at one of the rafting camps who will organize permits as well though they have useless gillies ... from here one can walk sections of the river and do your own thing.
Make sure you have right tackle for big rivers - its sad to loose a fish with a plug in its mouth due to poor tackle !