In short - no, especially not in your climate zone which is primarily focused on keeping heat in, instead of cooling.
- In your area a well sealed (to stop air from below coming up into the attic spaces) and well insulated attic is what is needed.
- A sound recommendation - get a real energy auditor or contractor in there that understands Building Science and renovations - not a salesmen.
As for the unheated walk-in attic with insulation between the rafters that is generally considered a hot roof and the attic space is considered conditioned (truthfully it is semi-conditioned but the "correct" term is conditioned). You didn't mention what type of insulation material or thickness there is and that is something that needs to be looked at to prevent ice dams and boiling summers.
- Should your ducts be sealed and insulated to R8 or better - yes.
- Do not buy into the radiant bubbles wrap - that only has an effective R-Value of .5 (not 11 / 13 / 30).
As for the second story - while a radiant barrier can reflect heat back down in that configuration, it loses its effectiveness as it gets dustyand if you haven't airsealed really well you are looking at having some major moisture issues which could lead to mold.
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