I have signal everywhere I go also with verizon, can't complain. But the Samsung processor international verison tends to be quicker, lighter on battery, and run cooler. I would be willing to go to AT&T and getting an international verison s7 edge if I had too. Because I know this phone has amazing potential. Honestly the best looking phone ever made as well.
Ok.. Verizon.. It has less options for a signal booster than AT&T or T-Mobile.
Also the international versions you lose some LTE bands. Also you are out of luck with Samsung service, Samsung USA won't support and last I heard, won't even repair for pay. That leaves you with no warranty unless you buy it from someone here that offers a warranty.
When I was with AT&T, 2-3 bars was low enough to drain my battery and I got a microcell, but they only had 3G. I think you can buy microcell that will work on any service, but they are expensive and don't quote me on them working for Verizon.
Verizon does have an extender, it isn't great and it really only helps for phone signal at home.
Your options for at least boosting your signal at home would be better with AT&T and much better with T-Mobile.
If you are experiencing the same drain when you have a good signal, then I agree with Tyler, do an exchange or send it to Samsung.