Oh alright I might just change my creative completely then!
Heya!
I haven't read your creative yet; will get around to it later! But I don't think you need to change it completely. I think having multiple creatives is a really good approach, because it allows you to expand on your ideas as you begin redrafting all of your older ones. I suggest keeping a copy of this creative, but have some ideas in your head for the different types of discoveries you could employ.
The point of this is to be really comfortable with just an outline of your main ideas, characters, and setting by the time you do sit the HSC, and then to have it completely moulded by the question. You can do so much with a fully fleshed out
idea, and by practicing it now, you'll only get better at making it up on the spot for when you do sit the HSC.
But if you're not, at this stage, stick with having your main ideas still fresh and having an A-range response ready up your sleeves. Overtime, you'll get better at it!