Ok, well if it's straight (truly flat) and the torque is relatively uniform then the most significant concerns come down to the yield strength of the fasteners and the head. You can't back it off a lot without possibly compromising the HG. I suppose if I ended up in your shoes and wasn't able to redo the job I'd try go the route I suggested.... lighten the load what little bit I felt was safe and then leave it alone.
Everyone would do well to actually read the service manual and the spec sheets for the parts you are installing/servicing prior to executing the job and take it on faith that they have some idea what they're talking about. Even with the lower torque spec these things held up fine for more than a decade... seldom blowing sooner than 100,000 miles. Toyota may have required a lower torque than normal but it performed just fine in my opinion.
I should have asked prior, what manual are you using?
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