There are a few quick ways of getting round the consistency problem for cheesepaste, and wondering of it's still on the hook if fishing in faster water.
If you consider that the paste will be working at a temperature of around 5 degrees C or less (ie air and water temp at this time of year, especially for those of us mad enough to be out late into the evening), if you make it and knead it for ages, the paste will get quite warm. If it's sticky (which it will be when warmer than about 10 deg C), put it in the freezer for half an hour to chill it, then check the texture again - you might find it's fine without adding any more cornflour. If you get the consistency right at room temperature, it'll be so solid when you're out fishing that even a crocodile would struggle with it.
Once on the bank fishing, if it's still not right, have a small amount of cornflour with you, break off a golf ball-sized chunk, and work in a little to stiffen the paste. If you overdo it, a little water added will bring it back. This way, you can customise the texture to both the ambient and water temp, and the water flow, and get it spot on.
If you're concerned about it falling off a large hook, such as a 2 or 4 for a conker-sized lump, if you hair-rig an 8 or 10mm pellet, and wrap the paste around this, even if the paste falls off, you're still fishing with some bait. I find the drier type of pellet work better for this (like Trigga-ice) as oposed to the oily sort, the cheesepaste just seems to stick to it better.
Mick