Thanks Jeff. I have solved my lozenge problem!
I gave up on tissue and tried Silkspan instead. Printed lozenge colours onto 8.5x11" silkspan - then sprayed the printed lozenge side of silkspan with oil-based varathane to seal in the ink - then applied silkspan to wings (white primer over plastic film covering) with water-based polycrylic. Silkspan is stronger and can be manipulated to remove any wrinkles as you apply it.
I will only apply lozenge to the outer panels of the wing, center section will be black with white stripes on borders.
So glad a little perserverance and experimentation paid off as I really wanted lozenge on my H9 bashed Fokker DVII.
Cheers
Brian