So apparently there's a formula to account for the increased torque when using a crowfoot socket:
https://www.tekton.com/blog/how-to-accurately-use-a-torque-wrench-with-a-crowfoot-wrenchIf the crowfoot is at 90 degrees to the wrench no adjustment needed...if it's not 90 degrees, wrench needs to be set to a few ft/lbs LESS...
Manual says torque on head studs should be 105....but GoMOG says 90...will probably split the difference and call it a day!
As always Arwyn - thanks for the advice...