I agree Geo, never had any problems with Vallejo either, just that orange, red, white and yellow can be a right pain in the tailpipe when it comes to coverage due to the number of pigments, wish that they were as good as black!
Still remember when working for SAAB and using these colors, it was never popular....
Which acrylic is best when it comes aforementioned pain in the tailpipe paints?
These are a (insert your choice of sentence enhancer here) nuisance at the best of times, thinking back to my time at SAAB....
I mixed X8 and XF7 together to get that deeper yellow on the tail. I don't recall the ratios as I mixed them in an empty Tamiya bottle to save me constant mixing