I think I have a problem with Mavericks: can anyone help,please?

A couple of days ago I installed Mavericks on top of my existing Mountain Lion OS. Not before I backed up the ML version with Time Machine, though.... :-)
Initially I thought everthing was fine, but then started to notice a few things that bothered me, which have not gone away. In fact, I think this install is now a potential problem. Unlike many other people, elsewhere on this forum, I have not noticed the calamitous slowing down and general unusability of Mavericks. I'm using a prety new i7 iMac ( the new flat one) with 32 GB of RAM.Everytihng worked great with Mountain Lion. However, The following anomalies have cropped up: Mail is taking over 30" to send a simple email. In ML it was almost instantaneous. I feel that Mail is not performing as it did in ML, and the same goes for Safari. It "feels" odd and slow and can take an age to load up pages. In fact one particular page would not load properly at all, but worked fine in Firefox. In the end got it to work in Sfari, but ithis type of behaviour doesn't instill confidence. Things got wierder...
An update to iMovie got " stuck" in the dowload process,and was perpetually downloading in Launchpad. It kept oscillating from approx 61 MB to aprrox 84 MB of a 1.94 GB file. Then I did a disk utiltiy test of my system drive and it suddenly stated that the drive need repairing. I booted up in Recovery Mode and tested the drive, which came back all clear! I booted up normally again and now the disk utility won't even complete a full diagnosis of the drive!It will diagnos all my other drives fine though.... :-s It keeps getting stuck on: Checking Volume Bitmap, and won't go any further. So, I did what some other person did on another thread, which seemed to clear up his problems; namely: simply reinstalled Mavericks from Recovery mode. This did not improve anything for me. The same issues remain. In fact as I type this, I notice that I'm using nearly 23 GB of my 32 GB of RAM, and all I have open is Safari, Disk Utility and Mail ! To quote Hans Solo: " I've got a b-a-a-a-d feeling about this..."
So, this is my long-winded way of asking: what shall I do? I would like to boot in Recovery Mode and reinstall my back up from an external drive. Does anyone have any advice about this,please? If I restore from my backup, will I actually get the ML OS back on the computer, or will I be stuck with Mavericks trying to impose itself ,as some people reported? I do want to use Mavericks, but not in the condition it's in right now. Also, really don't want to perfom a clean install and migrate everything over from the Time Machine back up....
Thanks for any advice.

I don't think that a software update from Apple will solve the issues that you are having. You have a rogue installation. After you posted I have just done the following:
Disk Utility can verify my partitioned Volume (including my boot disk) AND REPAIR the non-boot disks on the same Volume without a glitch. It repairs the non-boot disks containing data smoothly.
I have used Mail to send some mails from some Yahoo and Hotmail accounts to my Thunderbird client containing GMail accounts - absolutely normal.
I have iLife '09 but my iMovie '09 and iPhoto '09 open in a jiffy and I see no issues here. I have 6GB RAM (Maximum) on an early 2008 Macbook Pro with a 750GB hard drive partitioned with 120GB reserved for the Boot Drive.
I am sorry that I cannot help further but I am sure there must be a way to reinstall the software without having to revert to restoring your ML backup. I have two clones and if you have such I would attempt to do that through that rather than through Time Machine - that is of course if you have a cloned drive.
Good luck!

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