Hi everyone, thanks for all the ideas.
The tree locations are fine, they have been there and healthy for years. This year's issues appear to be the bitter cold winter that killed them down to the base, and in the case of the 1st tree, too much water kept in the ground. The previous homeowner who planted these plans to stop by this week and see if he can help.
Today I weeded and pulled any mulch further away from around all 7 of my trees (healthy ones first!) and found 2 issues with the first tree. The concrete rectangle I had used to hold 3 branches down for layering was keeping too much moisture under it. I should have moved it away after a week. Between that and the overwatering from the blocked downspout there was a ton of white mold or fungus under it, on the rooting branch and on all the mulch that had been trapped below. I removed what I could see and threw it away. Anything else I should do to that area? I had seen suggestions of using hydrogen peroxide mixed 50% with water to treat fungus on branches after being wrapped for the winter. I actually used that on some this spring (not these trees) and it helped. Would that cause more damage? It would get on roots, not just bark. Second issue with that same tree is definately a borer insect eating the dead wood that is left from Spring pruning away the winter-killed wood. The previous owner had said to cut where it still showed green, which was up to 12 inches above ground on most of the trees.
Here are photos of the white mold, the borer holes and sawdust piles, and the terminal buds that jdsfrance asked for.
After I removed the white moldy mulch and dirt, this is the branch I was layering- the only one with green leaves left on it.
Tiny borer holes and sawdust:
terminal buds:
And for comparison, this is the same tree September 2013, on the right:
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The second tree actually used to be huge (see last photo). I had said 3 trees, but I meant that is has 3 other stumps from the SAME tree around it. I saw no sign of a borer insect, there was not much mulch around the tree, and this one has not gotten extra water from a downspout, it is actually sheltered. So I don't know what the issue is here. It is behaving exactly like the one with those problems.
Here are pics of the second tree after I weeded around it:
In this first photo you can see on the far left corner and also in the center are stumps flush to the ground. In the back center are a few foot tall stumps I had pruned back this spring. These are all from that 1 tree.
This view from the side show vigorous shoots coming up where I keep pruning them back, much too close to the house. I am leaving them for now.
For comparison, this is the same tree September 2013.
Thanks everyone, sorry for all the large photos, I hope they help!