No I've had my reventon for a while and I just got a v2i, I switched them out a few times and when I go back to my reventon I hardly feel a difference, but for you it may be a little heavy but I doubt it will cause you to loose tricks.
Yeah my v2i is 21 too so it feels completely different so idk about like a 20 v2i, the reventon feels heavier and more sturdy, but the weight isn't noticeable when doing tricks honestly for me.
I have both and have ridden them quite a bit, in my opinion the 4.65 feels better. If you're scrawny as fuck then then the weight may effect you but I doubt it it's really not even heavy.
My SCS is running just fine and I have the same exact thing, I just cut some old forks and put a cut HIC shim on it and slid it inside and it works perfect.