I would imagine since it is a band around the device itself, good suction would allow it to twist better on the up strokes. So with you removing the suction would more or less result in less twisting, which defeats the product’s purpose.
I would suggest going for open ended onaholes weighing less than 300 grams, which is hard to find but i find the Handy tends to work very well with onaholes if they weigh around the 300- 350 grams area. Any heavier and it seems that the Handy is struggling on the faster strokes.