Macbook Pro (late 2008) with 8GB ram sporadic freezing / hanging

Hi,
Last year, I was running Lion on my late 2008 MBP with 4GB ram with no problems.  Whilst 4GB is the maximum officially supported for my machine, forum posts suggested that some people had no issues running it with 8GB.
I went for the upgrade and everything was fine, with no hanging - 8GB on Lion on my machine seemed to work fine.
When I then upgraded to 10.7.2 I had a separate issue (to do with an old install of PGP) which meant I had to do a fresh install of Lion from scratch and then restore from Time Machine to get it back working. Ever since I did this, I have experienced odd behaviour, notably:-
Machine has a tendency to hang / freeze every now and then for up to 10 secs and sometimes with the spinning wheel and sometimes also requiring a hard reset
Any mounted drives in Finder (dropbox, Truecrypt) sometimes don't come up at all, with the Finder progress wheel spinning in the bottom status bar of the window, and only a "Relaunch Finder" resolves this and allows me to access the mounted drive.
Machine seems a little sluggish despite me keeping on top of maintenance activities for my machine (as I used to for SL and Lion when I first installed)
I was wondering whether there was something whereby Lion would work fine had it been installed whilst the machine had the officially supported 4GB (and then later upgraded to 8GB) as opposed to installed on a machine with 8GB (which only officially supported 4GB) at the time of install.  As above, everything was working happily with the 8GB until I had to do a completel refresh from scratch.
Has anyone else had experiences of anything similar and can shed some light?  I am considering refreshing and restoring from time machine again with just 4GB in the machine and then putting the extra 4GB back in after the restore, but don't want to do this unless there is any evidence to suggest this will address some/all of the issues I'm experiencing.
Thanks in advance.

Thank you, basilmir.  Below are the specs from my Macbook prior to the Snow Leopard and RAM upgrade.  To upgrade to ML I needed to first upgrade from Leopard to SL.  I expect to do that later today.  In the same screen as below, I now see the memory as 8GB.  When I run Activity Monitor I am seeing 7.75GB so I am guessing that the video card is using the "missing" 256 meg.
Hardware Overview:
  Model Name: MacBook
  Model Identifier: MacBook5,1
  Processor Name: Intel Core 2 Duo
  Processor Speed: 2.4 GHz
  Number Of Processors: 1
  Total Number Of Cores: 2
  L2 Cache: 3 MB
  Memory: 4 GB
  Bus Speed: 1.07 GHz
  Boot ROM Version: MB51.007D.B03
  SMC Version (system): 1.32f8

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  • Macbook Pro (late) 2008 won't recognize HD and MAC OS X installed, but recognizes SAME HDD with Windows installed ... where is the problem !???D a

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    Thank you for using Apple Support Communities.
    Best,
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  • Can I use my old Macbook Pro Ram in the New Macbook Pro (late 2008)

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    Hardware Overview:
      Model Name: MacBook Pro
      Model Identifier: MacBookPro5,1
      Processor Name: Intel Core 2 Duo
      Processor Speed: 2.4 GHz
      Number of Processors: 1
      Total Number of Cores: 2
      L2 Cache: 3 MB
      Memory: 8 GB
      Bus Speed: 1.07 GHz
      Boot ROM Version: MBP51.007E.B06
      SMC Version (system): 1.33f8
      Serial Number (system): W8******1G0
      Hardware UUID: *****
      Sudden Motion Sensor:
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    <Edited By Host>

    For both convenience and speed, I'd recommend replacing the internal hard drive.  Your MacBook Pro can handle nearly any internal SATA 2.5" HD on the market, including 7200rpm models. For what it's worth, I'd recommend a Western Digital Black WD7500BPKX or similar or Hitachi HGST 7K1000 although in my experience Hitachi drives run hot and that's the reason I don't use them as internal drives.
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