Need Input: Best Way to Quote a Full Roof Replacement in Torrance’s Cool Roof Zone?

Hey Thumbtack pros,
I’m gearing up for a spring job that involves a complete tear off and install on a 2,100 sq ft bungalow near Torrance Beach and I'm going to hire TRM for this . The home sits in Climate Zone 8, so Title 24 cool roof rules apply. I want to deliver an airtight estimate—materials, labor, and permit fees—without hitting the homeowner with surprise add ons halfway through.
Here’s my current plan:
• Use Owens Corning Duration Cool shingles (0.28 aged solar reflectance).
• Upgrade to 5⁄8 inch radiant barrier sheathing on south facing slopes only.
• Swap all G 60 flashing for G 90 and lead boots.
• Include a ridge vent plus SmartVent  intake strip to hit the 1:300 ventilation ratio.
• Budget $350 for the city permit and $250 buffer for waste disposal overages.
Questions for the group:

1. Does splitting radiant barrier sheathing by slope make sense, or will inspectors flag the mix?
2. Have you found an efficient way to explain the cool roof surcharge during a Roof replacement Torrance sales consult so clients don’t think it’s an upsell?
3. Any hidden fees in Torrance we should warn clients about—re inspection, methane zone clearance, etc.?
4. For those of you who include a drone inspection video in your bid, do you roll that cost into the proposal or list it as an optional add on?
   I’d love to hear what’s working (or not) for fellow roofers tackling similar coastal projects. Real world numbers beat theory every time. Thanks in advance for sharing!