Well, I would think it is worth a shot. You'll only have to do it once and can revert to the use of isolaters if need be. I don't ever like using something to fix something that should not be an issue and is likely caused by something we're missing here. It will always be there nagging at the back of your head if don't at least give it a try, if you are anything like me that is. Just get a cheepo HU off ebay or amzon for testing (you can alws return it if your don't abuse it) and see if that fixes the issue, if it does, you can then exchange the HU and unless every one of this HU is the cause (very unusual), you will be good to go. i really think that you already isolated it to the Hu though, at least if I understand the info correctly that you have posted.
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