Transferred to secondary today and it smelled great. Now two more months
I'm sort of sorry that you didn't ask before you transferred to secondary because I don't think you will gain much from that. Most people that secondary do so to clear up the beer and there isn't any way you are going to clear up that winter ale, it's always going to be dark. I do approve of the 2 months but maybe not all in the secondary. Perhaps a week of secondary and then bottle or keg it to let it mature. JMHO
The instructions that came with the kit say transfer to secondary for 2 months. I know it's a dark beer, I'm not trying to clear up anything, just wanted to get it off the yeast sediment, it was 2 inches thick.
For your next brew session if you leave the beer in the fermenter longer the yeast sediment and hops (trub) will usually settle into a much more compact layer. That will leave you more beer on top of it that can be racked off for bottling.
You might want to leave it in that secondary for a couple of weeks before bottling. The extra time won't hurt a bit and will allow more dormant yeast to settle out so you don't have as much sediment in the bottles.
I had someone tell me that the air space in the carboy can lead to oxidation. I have about 3/4 of a 5 gallon filled. I've never had any issues with oxidation before and I don't plan on disturbing the carboy. Is there any truth to this?