have tried presenting the prey item and leaving it? this has worked p well with the African pythons (P. sebae, P. regius, P. anchietae) that I’ve kept - an easier way to increase/maintain humidity without decreasing air flow would be to switch to substrates which can both absorb and also retain water for longer periods of time than say cocofiber which absorbs water easily but gives it up just as quick - a good admixture is raw peat mixed with eco-earth