I have done similar exercises, I love the groove factor created by placing the metronome on 2 & 4, especially for swing/bebop lines, or any other feel where the snare drum would be on 2 & 4 (which is a lot!) Your eighth note variations are very interesting, & I find my self doubling the tempo of my ‘foot tap’ therefor putting them on 2 & 4 !!
I have done similar exercises, I love the groove factor created by placing the metronome on 2 & 4, especially for swing/bebop lines, or any other feel where the snare drum would be on 2 & 4 (which is a lot!) Your eighth note variations are very interesting, & I find my self doubling the tempo of my ‘foot tap’ therefor putting them on 2 & 4 !!