Hey Maurice,
Ok yes this type of player can be tricky for sure. But the main one to help is something you mentioned above and that is going for more spin on the open up shots in particular. Slower spin against these types of players is often much better than speed because they can feed of the pace and use it to thier advantage. So trying to heavy slow spin loops is key.
Also really trying to vary the placement and positioning on the table is vital, so finding the wide angles when you spin heavy and then when you get a weaker ball trying to hit quickly into the body.
But for sure the main key area here is slow heavy spin and trying to really mix up the tempo and not allowing the game to just be fast hard attacks which will suit this style.
Cheers, Tom