If you still can charge it, your phone is not too big. My phone is too big even for the charger. It just does not fit (Limia 1520 - 6"). I still keep it there just for convenience. Even if it would charge, it is hard to see how it could be useful. At least in my case. I have a huge battery, which lasts for a couple of days. So when I go to/from work it would not make any difference. When we go for a trip, I prefer to have it 100% charged (for hikes and such). It this case I would not trust this to wireless charger anyway. Yes, it takes a lot of space, but still I find it convenient and always put my phone on the charging panel.
Which Bezlel Case did you purchase? I noticed two available on Amazon; one type is offered at $49.99, the other is $18.99.
I'm trying to charge an S6 in a Defender case in a Prius Prime, and it doesn't work. The bare phone does fine, but removing an Otterbox Defender is a major task. So I have a wire for charging.