Why Won't Reminders for iOS Sync with iCloud?

I've been forced to use iCloud for Reminders now that I've upgraded to Mac OS X Mountain Lion. Because Reminders & Calendar share a checkbox on Mountain Lion, I've been forced to use iCloud for that, too, because once that checkbox is checked, Calendar refuses to sync with my phone via iTunes.
Now, the sole reason I've done this is to sync Reminders between my iPhone 4 and my iMac, but no matter what I try, after the initial sync when iCloud is set up, changes to my Reminders (additions, edits, etc.) refuse to make it to iCloud. I know because I've added and changed numerous reminders in the last few days, and none of those changes show up on iCloud.com. So this is an issue between iOS and iCloud's servers.
This has been going on since I upgraded OS X and enabled iCloud last weekend, and the only time I've managed to resolve it was by doing this:
1. Backing up all my Calendar & Reminders data
2. Turning off iCloud for Calendar and Reminders on both my iPhone and iMac (making certain to preserve the Reminders stored on my iPhone, which had the most recent changes)
3. Deleting all the Reminders shown on iCloud.com
4. Turning iCloud back on for both devices.
I'm not sure if all these steps were necessary (especially deleting the Reminders from iCloud.com), but the even if the other 3 steps are, it is unacceptable to me (and anyone with half a brain) to need to turn iCloud off and back on every time I want a backup of my iPhone's Reminders on a different device (in case I lose the iPhone or it is destroyed).
In case anyone was wondering, I've already tried all the troubleshooting steps at http://support.apple.com/kb/ts4000. I'm running the latest version of OS X Mountain Lion with all applicable updates, and my iPhone is running the latest version of iOS 6 (6.1.3) that Apple will allow me to have. Yes, that means I haven't patched the SSL bug, but I'm rarely away from home, and when I am, I am rarely somewhere with accessible (not locked) wi-fi. In addition, my home network is secured and running good encryption, so I'm not worried. I just turn my wi-fi off when away from home.
Oh, and upgrading to iOS 7 is out of the question at this point in time, because I don't like it (especially the look and the combined Address/Search bar in Safari, among other things) and I'm concerned about battery life/performance. Also, I've seen a class-action lawsuit going around right now regarding the fact that iOS 7 can potentially fry the Broadcomm wireless chip in older iPhones (i.e. mine).
So, with all this info in mind, can someone help me?

Welcome to the Apple Community.
Check that all your contacts are in your primary iCloud group, only contacts in this group will sync with your primary iCloud account.
In the example above I have a secondary iCloud account, but you might also see a 'On My Phone' group.

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