First your drawing is incredible. I wish I had your talent.
Have you considered using the oasis garland form? (Basically cylinder shaped lengths of oasis wrapped in sturdy nylon net all linked together.) This forms allows you cut them into individual pieces, use several links or use the garland in its entirety. IMO, if you cut the form apart, you may be able to stretch your flowers to cover the space more efficiently, create most of the work in your shop, insure the flowers will stay hydrated and still use them elsewhere in the wedding. I, too, suggest moving flowers to other locations. Afterall, I worked really hard and want people to have the opportunity to see the quality of my work up close.
We usually loosely wrap the back poles with garland, swoosh some ribbon in the wedding colors (by using more than one color - I think it adds a luxurious feeling.) and then add tucks of greens and flowers. If the back poles are too dark - they disappear in the pictures. I focus on the front poles.
Good luck.
Leah