Which crashes does the song need?
A useful crash has a job you can hear in the arrangement.
Take a chorus or transition where you are unsure about the crashes. Record one pass with the part you normally play, then a second with the crashes removed. Keep the other notes and tempo as similar as possible.
Listen without looking at the kit. Does a particular entrance lose its impact in the second pass? Does the vocal become easier to follow? Mark the moments where the difference matters and try restoring only those crashes.
A crash may reinforce a band accent, begin a section, or sustain through a pause. Its placement depends on that job; it need not always fall on beat 1 or accompany the kick. When you do intend a crash and kick together, check that you hear one attack rather than two. Ask the band which version supports the passage.