MSMA application in high temps

First my apologies on making a separate thread from my lawn journal, but I need a clear answer on this and this question wasn't answered in my LJ.
@Topcat has been gracious enough to provide me with msma to kill my crabgrass. My bermuda was seeded in late March. Current temps are +90 every day.

Sooo....
What application rate should I use per 1k or better yet per gallon?
Should I spot spray or broadcast?
Will this damage my bermuda at all?
I will be using handheld pump sprayer.

Pic of lawn. 32‰ nitrogen and water is making my grass very happy. I see why pgr could be needed in the future. Lol