Is it play or aggression ,or a little of both?

I just adopted my brittany hound mix, named Hopps. Well he loves playing and loves the dog park, so naturally we spend a lot of time there. Often times I wonder whether he is playing or if he is instigating the other dogs too much.

Heres some of his background info that may or may not have anything to do with his behavior. When he was in the pound, he was in a kennel with a lot of other dogs and often didn't really get much of the food (he was the more submissive one, lower in the order). Well then his previous owner adopted him, and he was used to playing with two other dogs, a pitbull and a very dominant female pomeranian mix.

Now Hopps is really friendly to people and even the other dogs. He is always wagging his tail, and he runs up and "plays" or wrestles or whatever dogs do. However, whenever we are at the dog park, Hopps is always the dog "playing" all the time and chasing the other dogs, and he gets real grumpy when the other dogs seem to need to catch their breath (I dont know how he doesnt need to catch HIS breath!) but he barks at them and growls until they "play" again, all the time wagging his tail. Sometimes, though, it seems he gangs up on some dogs and chases them when they don't seem to want to play (their tails are tucked, ears back, and running trying to hide). Of course when these dogs run, it just eggs Hopps on to chase more! A handful of times I have grabbed Hopps and made him sit and "chill" for a few so that he sort of stops and gives these dogs a break!

I love that Hopps is playing and getting his energy out and socializing with the other dogs, and he really does seem like he is just trying to play, but I dont want to have the most aggressive or most instigating dog at the dog park either. A few times I have gotten looks from the other dog owners, though these owners were the owners that had dogs that Hopps wasnt even playing with! Hopps is not even 2, so part of him is still very much a lot of puppy, but I guess I am having a hard time deciding when it is too much.

I am so used to taking my family's 4 year old labrador retriever to

the dog park, and that dog is sort of opposite of Hopps! Jack, the lab, is much quieter, and would rather smell butts than wrestle!

Am I overthinking it, or are there some things that I can watch out for?