Gee I like that second shot, great perspective and love the conferging verticals into that great sky, terrific cloud patterns and colors with detail in the trees, it's come up well... Merging shots like this really makes a dramatic image...
Sounds like a hard way to merge shots though with any foliage in the shot, must take a while and be tricky... I usually bracket and merge anything with high DR, dunno if this helps or not, spose different strokes for different images, but this way I do in a few seconds and is great for tricky areas like foliage and no halos... Looks convoluted, but once you've done it a few times, it only takes a tick...
I think I've posted this before so ignore if it's not helpful...
#1) open both the low exposure and high exposure images,
#2) make the low exposure image current
#3) ^A (to select all) then ^C (to copy to buffer)
#4) make high exposure image current
#5) ^V to paste the low exposure image into the high exposure image, this should paste in as a new layer
#6) Go to layers, make sure the pasted low exposure layer is current
then make a mask but clicking the icon that looks like a camera from
the front (didn't know how else to explain it...)
#7) Alt-click on the mask window (the white window in the pasted layer
pallette) This should give you a white screen/image
#8) Then paste into the white screen, this should give you a black and
white image
#9) Then just click on the background layer to make it current and hey
presto! Merged exposures...
10) Then you can make the mask layer current and hide the background
and clean up erasing any bits of the mask you don't want, just duplicate the layer with the mask to increase the "depth" of the effect from the mask...
Works a treat with foliage

Just in case it helps...