What type of shade cloth is best for my situation

[BrassavolaStars]

Hello All,

I am currently furnishing my greenhouse for my orchids and was wondering if anyone knew what shade cloth would be best for me.

I have Phals, Cattleya/Brassavola, Soft cane Dendrobiums, Paphs, and a few Angraecums.

The greenhouse is 6mm twin wall polycarbonate and it is situated in mostly sun (all day). The longest sides of the greenhouse face North and South and the West side sun is partly blocked by my house

I live in southern NY (only a few miles north from NYC). The max temp in summer is about 100F with high humidity (70-100%) and most of the summer is around 86-90F.

I have tried putting my phals in the greenhouse only to have them get badly burned so I definitely need something.

Would 70% shade be too much? This is the cloth I ordered but I could still easily return it.

PS: the plants will be very near to the walls.