Mirtazapine Tapering

Hi guys,
So I have been on mirtazapine for roughly two years and the weight gain has really gotten me down so I made the decision (in consultation with my doctor) to come off it. I was on 30mg at night and I had heard about (and experienced previously) what happens if you just stop taking it altogether. With this in mind I tapered down to 22.75mg for about 10 days and am now on 15mg. I don’t feel any different in my mood, which is great, but I’m also not noticing any of these withdrawal symptoms I’ve read about (or do they only occur when you go cold turkey?), but most frustratingly, I’m actually putting MORE weight on - not much but lessening my dose combined with not eating any sweets (which has been SOOOOO hard), I would have thought/hoped would have the opposite effect?
I guess what I am wondering is do I still have too much in my system and once I’m completely off it should this change? And also, while I’m quite pleased I’m not having any of the nasty side-effects, is that normal or is it another sign there is still too much of it in my system?
Thanks heaps,
Nicole