I would use mostly artifact creatures and keep kemba, puresteel, and the soul warden. no real need for iona. the main focus of this deck should be to play low cost creatures and equip them to make them beefy correct? well it seems that your low cost creatures can be artifact creatures and the afforementioned cards. keep the white sun as well because it's just more functional to play those instead of casting things like iona just to risk it being countered.
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I'd go back to straight W/U. use more artifacts like the tumbles. those are amazing.. also abuse the metalcraft mechanic for things like dispatch, and side stuff in like silence in combination with mnemonic wall to keep bringing your "mean" instants back. prophetic prism is also good because it gives you a mana color when you need it, particularly helpful in blue white control when you want to use counterspells but just need that one more blue. if you want you can look at my W/U for an idea. I know you don't want to feel like you're net decking but hey after awhile everything is done at least once in this game