grind point recognition and pump momentum

anybody else run into the problem where lets say you wanna grind a handrail down some stairs and the game for some reason decides that you are instead trying to grind the step so you only ollie an inch off the ground?i feel like there isn't any priority programmed with which objects you are trying to grind. you have a 50 50 chance of actually making it up to the rail height or not. and the momentum when pumping in a vert scenario feels completely random. sometimes you get a random speed boost when landing a trick on flat and sometimes all your speed is instantly killed when hitting a vert slope.