Trying to Write Amen Break for Drums

I'm new to MuseScore 4. I'm trying to learn it by writing a simple groove from Amen Break (https://en.wikipedia.org/wiki/Amen_break).

I create a new score with 4 measures, I insert all the closed hi-hats on the first measure then move the cursor back to beat 1 and insert the first two bass notes on beats 1 and 1& using the SHIFT key to add bass to those beats which already have hi-hats.

Everything I try to transcribe from that point on is wrong.

I insert an 1/8th snare on beat 2 and toggle the augmentation dot on that note. Wrong, Musescore adds that augmentation dot to the snare, but also the hi-hat, which is wrong.

I want to add the snare on 3e. I cannot move the cursor to 3e, my only choices are 3 or 3&. I try to insert that snare by moving the cursor to beat 3& (on the next hi-hat note after 3e), selecting the 1/16th note duration, and inserting a snare with (key 'A'). Unfortunately, that operation inserts the snare on 3& instead of 3e, and also pushes the existing hi-hat that was on 3& to 3a.

I've followed some simple tutorials on Youtube that get you started writing drum sheet music on MuseScore, but the trivial grooves they teach don't have any syncopation, so they don't run into these sorts of problems.