If it is anything other than oak you should be fine. I think you'll be fine if it is oak. Last year I burned a lot of 1 year old oak (more like 15 months) and it was awesome. We'll see what 2 year old oak is like this year. If it's maple (your handle), your golden.
I would do long rows of wood over the wood all bunched together (as in the first pic) to facilitate drying. But after a couple of year it won't matter.
If you're seeing light brown powdery stuff it's not neccesarly a bad burn, pretty common in the top few feet of a liner.I burned alot of one year red oak last year and it burned really hot and I never saw smoke coming out of the chimney when I got her going, one of the best woods I burned last year as far as heat output. When I cleaned the liner this past month It was loaded with powder like creosote and I have no problem blameing the red oak for that. I split some of that same oak to do a moisture check and it was still at 28-30% moisture. Although I liked burning it it will not see the new insert this winter and will have to wait for next winter and it should be the bomb.
Great Job there, its a lot of work to get there, but once your there. It makes life a lot easier.