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You should definitely do the radio upgrade also. The whole purpose of this upgrade is to upgrade the radio and how it interacts with the OS. Base OS is unchanged, the ext-rom updates the radio .dlls and the compact flash drivers, and the radio programming itself is upgraded.
If you didn't upgrade the radio stack, upgrading the ext-rom isn't going to help much.
You can install just the radio update, which will leave your ext-rom as you have it now, but it will do a hard reset on your phone. When the phone hard resets, your custom ext-rom will install (minus the adware), but you will later have to unlock/unhide it again to modify further, if you wish.
I have been running mine with only the radio upgrade and my custom ext-rom for over a month now. ROCK SOLID on all accounts. Not one lockup, data connects/disconnects as it should, etc.
Hope this helps.
-Paul
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