@Domzy84 - I presume you know this, but in general, beam thickness and power potential have a divergent relationship. The thinner you go in beam, the lower the innate power potential, and the more that
hitting weight and
string explosiveness become the two predominate power sources. It just is what it is. Can't escape physics.
That being said, there are certain thinner-beam racquets that use higher-power beam shapes and more firm, higher-energy-return layups. Towards that end would be stuff like the current Dunlop CX's, most with RA's in the mid-60's. Also Head Prestige, Gravity Tour/MP, even Radical Pro -- most with mid-60's RA's in recent generations. There's also the Babolat Pure Strike VS / 97, Tecnifibre TF40's, even TFights at only .5mm more thick, and the Wilson Blade 98, 100, and probably the highest power-to-weight-ratio thinner-beam stick on the market, the Blade 100L, which has a Pure Drive -like layup of 69-ish RA, yet has the same mold, drill pattern and string bed response/control as the regular 100. All of the aforementioned sticks are <=22mm in beam width (other than the TFights).
As for the Prince Phantoms, they are some of the
lowest power-to-weight ratio sticks on the market. To get any amount of free power out of them, enough for the modern game at least, they need either larger amounts of hitting weight or launchy string beds -- usually both; often more than a player ideally wants. Don't get me wrong, they're wonderful feel and finesse frames, which can still work well enough for casual or certain lower-grade competitive play, but if you're trying to get absolutely as much out of your thinner-beam racquet as you can for free, I would look elsewhere. Just my two cents, anyways.
Hope some of that helps. Any questions, feel free.