Question on screen angle

Hi, I have a 4cp label that has a PMS blue screen for the background. All four process colors touch the screened PMS color. The screen angles I use for the process work are:
C: 7.5
M: 67.5
Y: 22.5
K: 37.5

My question is what angle should I use for the PMS color to avoid a moire pattern? I know screen angles should be 30 degrees apart with the exception of the yellow so can I use a 97.5º angle for the PMS? I am not sure how high you can go with screen angles.

Thanks in advance!

Molly