How can I 'reset' the inertial scrolling in Chrome?
Are you referring to top and bottom bouncy or left and right bouncy?

If left and right, it's because Chrome uses two-finger scrolling for back and forward before allowing bouncy. (I.e., if you can go back to a previous page but not forward, you can bounce on the right side but not the left. If you can't go back or forward, you can bounce on both sides. If you can go back and forward, you can't bounce on either side.) If you have two-finger back and forward gestures off (as I do), you still can't bounce laterally (which is very annoying, as I like to idly bounce the webpages as I read them).