Those are really cool rules though… If a bit more complex than the existing rules.

 All the fixes that I could come up with for Force Fields were more clunky than the current rules and really didn't add too much to them to be worth it.

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That's the thread I posted on the Rogue Trader forums for suggestions.

Are the "burnout rules" House ruled or from a book?

if they are House then will some one repost them here.

 The way our GM ran fields when my Word Bearer started with a poor quality conversion field was identical to the core rules (D100, on a 50 or less the damage is negated - if 15 or less the damage is blocked but field shuts down and -30 tech-use to get it working again with proper parts). I was wading through hellhound and leman russ barrages with it. The way he balanced it was all fields could have one overload, after that if it went again it burnt out and required a negative Infamy test to find the parts and then something like a -60 tech-use test to jerry rig the thing back together. 

Most of the group decided to get better weapons rather than fields and after mine overloaded to a random lasgun shot, I had second thoughts on when and where I used mine. It really seemed to work out well for us.

I've considered having 'normal' fields not be capable of shielding someone of hulking size (like a CSM in Power Armour). Legion models of fields are one step more rare. This makes it a bit easier for normal humans to get them compared to CSMs, and it's the squisher mortals that need them more.