Bullseye pink, plum and salmon pink "opal" colours

[noora]

A while ago I bought some striking "opal" bullseye sheets from Warm Glass: pink, salmon pink and plum. I've tried them in a few different temperatures and ramps, but the colours end up uneven and a bit dull. Are they supposed to be like that or do I need to find better temps/ramps? Any tips?

[Zeldazog]

I don't recall having trouble with the other two, but I've often had the scummy effect with salmon pink, which I assumed was de-vitrification.  Not had unevenness even with that though?