Loops, i'd really resist changing the rig as when you were on form you really got on well with both scope and gun.
I wonder if you can have material removed from the stock. I think the cylinders on the EV2 are steel, so perhaps someone does an ally or titanium one..?
Apart from that i'd look at how the gun balances... a heavy gun can feel lighter balanced well and vice versa.
The only light scopes I know are the Leup comps and the march 60's. The comps are fixed and I think coming from a nikko you'd take some time to get to grips with it, and the march which I think you'd get on with just costs and arm and a leg.
Stick a picture up of the rig and see what can be cut off, drilled out, or exchanged...