I also play with the PDR. We keep both strings around but I've always preferred the RPM Blast. Focus Hex and Black5Edge both make great substitutes for the RPM and I prefer them to the Cyclone. The Cyclone has great spin potential but always made a weird sound in the PDR that I never could get used to.
The RPM Team seems to play very well and hold tension somewhat better than the Blast. It is just a little softer but plays very well. You may want to try it.