No difference in Difficulty Levels

I really like this app, but quite frankly, I do not notice any difference between the levels. The latest Spiteful Difficulty seems no different than the Diificult. How can you call it spiteful when the computer plays right up to the card on the top of my stack? And often from its hand or from discard pile, when neither gets it closer to winning?

Bollywood Fan about Spite & Malice HD, v2.11.0