I will post some pictures tomorrow.
Your NG looks very nice with good branching. You got it this year right? Will be a beautiful tree.
I noticed my tree woke up quite late last year but this year it woke up very early, as early as the apples.
Perhaps you are seeing the delay like I saw last year.
Are they are still in pots? If so, you can put them in a very sunny spot: next to a road or a wall and heat it up? Or maybe a greenhouse? My trees were in pots until last weekend when I finally planted them.