HTC EVO 4G :: How To Get Better Version Of PRI?

I got my Evo on the first day. I rooted it and was using the Bugless Beast. I then really wanted 2.2 so I did not do the OTA. I did whatever was recommended at the time to go to 2.2 and not lose root. I just followed the guides and unfortunately don't remember what method I used for either one. Months later, my phone starts to reboot whenever, so I try to do research and I see I am on the PRI 1.34.

Now I know that has nothing to do with my rebooting but now I am trying to get a better version of the PRI. So I do the 2 step unroot method (HTC Sync and RUU) after doing the unrevoked forever with the S-ON feature. Well I'm still on the 1.34 PRI. My phone does not reboot anymore. But now where I work I am always on 4G Roaming or 3G Roaming. How I can get back to stock 2.2 with at least 1.70.