Ian, pass and do well on your exams first, your education should be priority

In regards to your question, like Rod said, check to make sure your bait is still on or else you'll be waiting for nothing.
You'll need to experiment with your flour, peanut butter/curry powder, water ratio to find the best mix. Your dough should contain as much peanut butter/ curry powder as possible (this is what attracts the fish) but with enough dough to keep it together. The peanut butter is oil based won't hold alone, the flour is there to keep things intact.
The amount of water is important too. Too much water and the dough will be saturated and sticky and will fall off quickly. Too little water and the dough won't hold together. In short, you dough should be as moist as possible but not stick to your hand.
When I fish, I usually take out a small chunk of dough from a sealed container so the air can dry it out. If its too dry, I just add a few drops of water.
If your from Vancouver, you can always try fishing from the South Van side of the river. From the Richmond side, I saw some docks which appears to be at the South end of Kerr St area (where there are alot of apartments). My co-worker also told me that there is an area off Byrnes(spelling?) road between Boundary and the Queens Borough bridge.
Oh yeah, keep the hooks and bait SMALL as the peathmouth chubs have small mouths. The hook size should be about 1cm in length (don't know the acutual hook size).
Good luck on your exams and study hard!