Back to OP –
I in my nearly three decades riding have got rid of and sold bikes because of so many reasons, did not climb well (Bullit) did not like the suspension system (Blur lt VPP) some where the wrong size (Nicolai cc Marin Pine mountain) some where rubbish( Gary Fisher Cake) some where the wrong wheel size (Yeti asr 7 26), a lot through injury and many more excuses, some I really regret selling (Litespeed Kitsuma/Turner RFX) and I will continue look and ponder because something is new and shiney over there but……
so I would suggest that on this occasion hold onto the bike ( unless you have sold it), as simply it is a great bike, you liked it as Fasthaggis pointed out, so it does not have-
the latest geometry – unless you are a world cup rider- so what it will not make a huge difference that 0,5 degree headangle
REar wheel flex – I have generally not noticed that on 90% of bikes that I have owned – gary fisher cake actually yes – ridden a 29er alpine and did not notice it flexing at all and if it does so what.
Weight – do not become too worried I am some where between 14.5 and 15,5 stone, and have come to recognise that weight can equal strength and reliability.
As above get fitter if you need to and look at the bike as an aid to that.
Things will change in 8 months you will feel different and there will be a whole new set of bikes to consider.
Enjoy what you have got for a while…..