Interesting Jim, I'll have to keep an eye out for that.
It does seem as if the trees on BPB #2 have been made somewhat easier, I used to catch them about 1 round in 10 but lately it almost never happens. I haven't tried going through the tree on CCC #4, I always hit full b/s to get over it.
Olympic #1 seems to have only holographic trees, I don't think I've ever hit them. Wish I could say the same about #10 though, that hole can really wreck a round.