Reg: Downgrading and data management

Hello all,
I've been experiencing some performance issues with my Mac Book Pro lately (I've been having trouble using more than 5-6 tabs in safari or chrome while using itunes and Microsoft Word); I've bought this notebook in mid 2010. It's the 13-inch 2.4 Core 2 Duo with 4GB 1067 MHz DD3 ram. Now I've been running OS X Lion for a long time and to be honest I haven't experienced any major improvement on the performance aspect of the operating system (functionality probably went up) but never thought of going back to SL bevause I never actually tried to backup my data.
I had to make a fresh installation after my hard drive failed me so I went again from SL to Lion trying to give it another go but keeping a backup this time of all data in time machine. So my questions are the following :
1) I was informed that Lion does not fit oldest models quite well and Snow Leoppard might be a better option for a Core 2 Duo rather than the newest OS. Any feedback on that?
2) I'm leaning towards downgrading. I know I can simply go back by finding my first backup on the time machine. If I do that do I also loose all data stored up to this point? Is there an option of copying from Lion backups to SL OS ?
3) Should i be experiencing this level of performance? I mean I'm I just asking too much from the notebook to handle (given I only have 4 GB or memory)?
4) would you suggest rolling back or waiting for the next major update in a couple of months ?
Thanks a lot.

Well initially I was thinking my hard drive was the issue (faulty) thus I've run the diagnostics apple requested and I did change the drive as they suggested. (quite funny process as my disk would oscillate between 20Gb of free space and 0Gb in t=3 seconds)
After that I simply stopped trying to sort anything out, looked into using alterntive software ( have been trying out chrome for the best part of the past 2 weeks ) and I eventually shut down the mac-book as soon as I'm done with any major job i need to finish. I simply couldn't afford any time on playing arround  (other than running the normal disk utility repairs) as I'm in the middle of something rather too important to try on reinstalling everything.
I'm not a hard-core user. The MBP is left on sleep most time and it's used on word processing, safari itunes and in worst case scenarions fm2012. (definately not all in parallel). Is there a normal diagnostics procedure I could follow to dig something up ?

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