if we're going with "full potential" then Wally wouldn't want to attempt to speed steal from Hulk, as it would take an infinite amount of time to do so (given how Hulk is merely the vessel for energies flowing from another universe).
dumping Hulk in the Speed Force would be a bfr victory but Hulk would probably begin collapsing that dimension, with the kind of punches he was throwing at the Nexus of all realities or those with which he broke through the Time Stream.
if Wally does an IMP, he would only hurt himself, in all likelihood, as there is no established upper-limit AND there is an established EXPLICIT mechanism stating that Hulk's DYNAMIC attributes would exponentially grow into infinity.
giving Wally his theoretical full-potential or extreme high end use of his powers would make this spite unless The Hulk's powers are similarly taken as stated at their full ("infinite"/"limitless"😉 potential and his extreme high-end (channelling two universes of energy through his body, rocking infinite worlds with his punches, The Beyonder comparing their similar infinite natures, Hulk punching through the TimeStream, absorbing and amping from nuclear explosions, having no fatigue whatsoever, having a continuous exponentially improving set of physical stats ...) feats ...
it would end badly for whoever fought Hulk, below Cosmics, if "Hulk were written properly" which of course he rarely is, because it'd make every comic a one-punch/finger-snap victory for Hulk.