Eh? How are those related? The latter duty isn’t to have that much wood in storage, it’s to collect (from any source, mind) that much wood. If you collect 200M, spend 250M, collect 150M, spend 100M, and collect 200M, you have accomplished the duty, even though your storage might never get above 300M. This would only be a problem if you desperately need your iron collector to also be collecting wood. (Which you shouldn’t; there are many better wood collectors than Champion Windgnasher.)
Heh, yeah, journeys are dumb. Do you at least use Astrid and Fishlegs? Their cheap journeys are at least short enough that if you only log in three times a day for your mystery pack, you can still finish one per day, so you can keep sending that pair over and over with minimal extra effort.