I believe one of the main reasons for Power's recent increase in ratings is the resurgence of new (quality) hip hop and r&b (which some urban/rhythmic hip hop fanatics are discussing in the chr/rhythmic/hip-hop section
http://boards.radio-info.com/smf/index.php?topic=193179.0) in addition to some other pop musical evolution factors.
I'm not sure how long this resurgence and new wave of hip hop / rap is going to last, but right now it's apparent that dedicated hip hop and r&b artists are trying to get serious and make a change instead of just continuing to talk about how bad things have gotten without putting in any effort to change it.
I believe another thing that is somewhat contributing to this resurgence of hip hop & r&b is the fact that some rhythmic artists have gone so far pop and electro (example; Lady Gaga doing things like "edge of glory", etc.) that certain rhythmics had to decide whether they want to go that direction with their sound or drop certain artists and stick with their hip hop lean. Many have chosen to fully drop Lady Gaga and similar things (even their recurrents) and take advantage of / fill those slots with the new crossover r&b hip hop hits and drop the heavy hip hop recurrents play a bit. I'm here in L.A. and see that some of the talk that I've seen in the chr/rhythmic/hip-hop section is true; Power 106 has dropped Lady Gaga and other similar things from main playlist and started to (slightly) focus more on the new hip hop sound. I've noticed that Power 98.3 Phoenix has pretty much done the same thing.
With the resurgence in mainstream hip hop and r&b hits, I believe Power 98.3 will benefit and have longer and better success than previously predicted because they are pretty much the only ones fulfilling a dedication specifically towards that sound. I guess 101.5 JamZ
could shift back to a more urban lean, but... in some ways, testing that sound wouldn't exactly make much sense, due to the fact that they (already know that they) are doing well with the format style they have NOW. The best bet is to keep things the way they currently are, with KZZP, KZON, and KKFR sticking to their current sounds since it is all working for them at the moment and they are all fulfilling a purpose.
As long as people continue to release new hits like this:
Dj Khaled - I'm on one
YC - Racks
Trey Songz - unusual
Lupe Fiasco - My Head
Chris Brown - She ain't you
Big Sean - My last
Wiz Khalifa - Roll up
Chris Brown - Look at me now
Tyga - far away
Jeremih - down on me
Nicki Minaj - Super bass
Lil Wayne - How to love
Waka Flocka Flame - No hands
Kreayshawn - Gucci gucci
Lupe Fiasco - Show goes on
Bad Meets Evil - Lighters
And other "back up quality material" mixed with "urban influenced rhythmic melodic hits" that people will love:
Frank Ocean - Novacane
LMFAO - Party Rock Anthem
Kelly Rowland - Motivation
Pitbull, Ne-yo - Give me everything
T-Pain & Chris Brown - Best love song
Kanye West - All of the lights
stations with the KPWR / KKFR / to even the WQHT.. etc. type formats will most likely continue to successfully keep their place in a (major) market. In addition to all that, it's possible that some rhythmics and non chr pop leaner rhythmic stations that once fell in ratings due to a new trend sound are now somewhat being helped as people "look for a temporary escape" from the current, heavily played chr sound.