Thanks Stefanie & Betsy.
Stefanie, I dropped my kiln temp to 500, it was at 518 before. Nothing else seems to have cracked or been affected, so I will probably leave it there. As for what I did, I honestly have absolutely NO idea how I managed to get the copper colours. As you can see (especially on the rounds), some of them went copper colour & some didn't but I tried to handle them all the same way. What I *can* tell you is that on my miniCC I didn't do anything even remotely like Jed's video. I turned the flame about half way up (increased the propane until the yellow candles were about 6 inches long) & waved the bead around in the end of the yellow candles.
I also have a set of donuts that I made that I haven't photographed yet, they turned out much the same as the rounds. A range of colours from green/gold right through to copper & pink. And were worked the same as them as well.
Still haven't got a clue what the secret to working this glass is!!