Thanks, he gets lots of bully sticks and chew toys...I also add a bit of plain yogurt and sea kelp to his food. I've been trying to get knuckle bones for the butcher, but with no luck. :/
If you can't find knuckle bones, you could try an antler or water buffalo horn - ours loves his. You could also try raw lamb ribs or some pigs feet. Ours wasn't a super aggressive chewer, so I used to give him femur slices from the butcher and let him strip them/get the marrow out. Since it's a weight bearing bone though it's a tooth breaking risk for a hard chewer.
Ours' ears weren't totally up by 6.5 months so we taped at that point and now they're fine. We also added unflavored gelatin to his food, per a recommendation from here.
He is a cutie pie. As mentioned chewing helps those ears goes up. When teething you may see those ears do all types of things. I have read in this forum some people use Knox gelatin to strengthen the cartilage in the ears. The ears look like they are on their way up.
Our long haired WGSL pup's ears didn't fully stand until 9 months, even with lots of chewing. We weren't worried because we had another pup whose ears took that long. Sometimes you just have to be really, really patient!