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I'd say get a new MAF and hope for the best. My Tip shifts a little smoother when the MAF and intake leaks got fixed. I think the tip takes the gas pedal position into account when deciding about shifting and if the MAF or intake leaks are throwing off how the car is running and the pedal position isn't normal for the speed & power level actually being developed. That's just a guess by me.
MAF cleaning didn't do anything on my car. A new MAF fixed it. Of course it won't fix it if you have genuine intake vacuum leaks. So a smoke test to search for intake leaks would be a good idea. It found a big leak on my brake booster vacuum pipe.
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