vitlyluvi,
Firstly, are you referring to a roll or pitch PIO?
Secondly, during the decreasing speed/increasing AOA approach are you retrimming or maintaining a pull force? If not retrimming then the need to hold a progressively increasing puill force may make it more difficult to make small, precise control inputs and thus exacerbate any PIO tendency that exists. PIO tendencies can be mitigated to a greater or lesser extent, depending on the severity, by adopting an 'open loop' control strategy but this is very difficult to do if the aircraft is not in trim such that you can, effectively, release the controls.