Erel:
I have already retrieved the layout values as I was suspicious of the Z3 having soft buttons for back and menu unlike the Note 3 which are off screen. The respective values are: (NOTE 3 - 4.89, 1920, 1080, 3 as expected) (Z3 - 4.36, 1794, 1080, 3 a little surprised by the 1794 but guess expected).
The variants I was originally using were (320x480,1 phones and 960x540,1 & 1280x800,1 to target my tablets) These worked on all phones I tried it on and the phones picked up the 320x480 variant. When I had the Z3 problem with the test I tried a new variant 724x407 to directly target the hires Z3 and Note 3. The Note 3 used this new variant and it worked correctly but the Z3 continued to use the 320x480 that didn't scale properly. This is when I retrieved the layout values and saw the difference in the Z3. So I have created yet another variant to try and target the Z3 reduced resolution(676x407,1) but I have not been able to try it yet on the Z3. It is my son's phone and I haven't sent it ti him yet to try. Of note is my Note 3 actually uses this new variant (676x407,1) which surprised me but it looks correct.
I have attached 2 jpg screen captures - one from the Note 3 that looks correct and one from the Z3 which does not plus you can see the softkeys on the right side of the Z3 screen shot. The Note 3 image is 172 kb and the Z3 is only 84 kb which is also a little strange.
Thanks for any help