As a mountaineer in Washington I hope you know what the hell you're doing climbing Shuksan. If you're not going with a guide you better be proficient with ice axe self arrest, rope team travel, and quickly setting up a z-pulley system for crevasse rescue.
Tubbs and Red Feathers are absolute pieces of crap. They work okay in consolidated snow and gentle terrain, but this is not what you will encounter. Not only is this the snowiest place in the world, you'll encounter a wide variety of types of snow. People around here who actually go in the mountains in unconsolidated snow conditions (which is still right now) either use Atlas 11 or 12 series snowshoes, or MSR snowshoes (lightning or evo ascent). No one I know uses anything else.
I've not rented snowshoes from REI or known anyone who has but I can guarantee you they rent MSR snowshoes. That's what I would do in your situation.
On a normal year, people usually don't start regular hiking in the mountains until July. Everything is month behind right now.