Sorry if this has been asked, but is there any chance you could increase the storage to 255 viable. I'm a horrible pack rat....and its always annoying leaving stuff behind or having to make mules or w/e they are called.
You can increase personal storage to ?30 slots, by buying it in Cash Shop.
Another solution to your problem would be one of the following:
A] Have a storage alternate account character/mule.
B] Have a mule within your account.
Maximize all the require inventory spaces, and you should be okay.