Critique My Negotiation Email Before I Send It

You've drafted the negotiation email and your finger's hovering over send. This reads it back to you against five things: tone that's firm but not aggressive or grovelling, framing that leads with value, an anchor pitched right, and whether you've left room to move without looking desperate. Fix it, then send.

Please critique the following negotiation email I have drafted before I send it. Evaluate it against these criteria:

1. Tone: is it assertive without being aggressive or apologetic?
2. Framing: does it lead with value and interests rather than positions?
3. Anchoring: is the opening ask appropriately ambitious and justified?
4. Flexibility signals: does it leave room to negotiate without showing desperation?
5. Clarity of ask: is it obvious what I want the recipient to do next?
6. Risk of relationship damage: does anything risk souring the relationship?

For each criterion, give a rating (Strong / Adequate / Needs Work) and specific rewrite suggestions for weak areas. Then provide a revised version of the full email incorporating your suggestions.

Here is my draft email:
{DRAFT_EMAIL}