Apricot leaves curled and underdeveloped coming out of dormancy

I live in northern Wyoming, USA, and I have a Chinese apricot that I planted two years ago. Last summer it more than doubled in size and was thriving. I was very excited for an expected fruit crop this year as it seemed to develop really well. I did some winter pruning to prepare it for a great season and things were going well I thought, but it started to open its flower buds in April and then we got a few late freezes. I expected the flower buds to suffer and not to get any crop which looks to be the case, but what has me really scared for the life of my (best) tree is that it seemed to freeze in time after that first late frost, and took forever to come out of dormancy. As it did the leaves were very slow to open and have emerged curled and underdeveloped.

 I fertilized as soon as the buds started to swell. As a result the tree is growing fairly vigorously (3-4 inches) in places but there are still a lot of buds that haven’t even opened yet. The tips of many of the leaves have blackened which I chalked up to frost but even the new leaves from new growth seem to be suffering the same thing as all the rest

I also removed (manually) some soft scale as the buds were swelling and it seems to be free of that. I just now finished applying a copper fungicide just in case it’s a fungus problem.

 So I’m not sure if this problem is due to fungus, or pests, or the late frosts. Or is it a symptom of root rot or some other damage. I have the same Chinese apricot growing a few feet away that I planted last year and it suffered from shock the whole warm season and was slower than my other fruit trees to come out of dormancy tooand while it initially had the same leaf problem it seems to have bounced out of it and seems pretty happy now.