Distance comparison CC2540 vs CC2541. Unexpected results.

I have both CC2540 & CC2541 key fobs and built & loaded my code onto each to do an A/B distance test.

Now I believe the CC2541 is a less powerful chip with a lower signal power.

Connecting to my iPhone app, the CC2540 lost signal at around 45-50 feet, while the CC2541 was still connected at 60 feet.

This is the opposite of what I expected.

Is there something I need to change in my code (I started from the SimpleBLE code) for the CC2540 to give it it's proper signal?

Thanks