Innova's Gummy & Candy Plastic

I am curious about a couple disc's I just purchased. I have a number of Gummy's but am curious if they a the real deal. Are there any tell tail signs of a true gummy? Also, how do the gummy's differ from the candy discs? I bought a 150g Gummy Valk a couple months ago, and LOVE IT, but when I recently got my newest 154g Gummy Valk I was a bit shocked at the flight. It seems to differ dramatically compared to it's lighter counterpart. Now I am on to a Candy, but I was curious what some of you had to say about them.