Zorro,
Nice to hear about the progress. I'll throw yet another opinion based on experience into the mix. Plant the plants.
If you do decide to drain the water as mentioned above and if you are moving the residents from your hex to the new 55, I'd fill the new 55 with water from the hex even if it takes a couple days (25% per day from the hex, however that works out). This would help with all sorts of stuff. Also, since there is no bio load on the new tank yet you could put the new filter on the old tank for a little bit, or trade filters, to get the colonies going. There are a ton of options. If the tanks were near enough to one another in my house, I'd set up an exchange between them so 1 would pump to 2 and 2 would drain to 1 creating a huge sump of sorts. This way the water quality doesn't change, the bacteria colonizes and everyone is happy.
In theory, if you use all old water, and the old filter, and the old fish, the bio load will remain exactly the same and you would not have any sort of serious cycle at all.
My only concern with moving piles of snails before moving fish is that their food chain is interrupted and could cause problems.
Good luck!
Nate