Is there a way to tweak individual radius and diag lengths associated with each tower?
yes read the wiki page on deltas. It is well documented.
That's were I'm stuck - I'm referring to adjustments for diag and radius for the arms associated with individual towers - I see in the Wiki diag and radius are for all towers together.
Also, I played with tower offsets - they have no affect on output - -I expected some x-y dimensional change.
I appreciate your guidance.