Maybe I'm doing it wrong then...If you add all of the structural upgrades you should have 255 slots.
Been using Mk III [Gold] for my Element Barrels...but I'm only able to put 7 Storage Upgrades after installing Mk III, not 11. And can't install Mk III without Mk II, etc.
Edit: Watched a mod spot and didn't see anything different. Noticed the 243 upgrade in the presenter's NEI but he didn't use it in the spotlight so...googled it.
From 'Official' FTB wiki: "This item cannot be applied to a barrel without changing the configs since it uses 243 upgrade slots."
So yeah, troll.
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