practice..
that's the trick. Have your drummer practice with a metronome or click track until he doesn't need to anymore.
Have him try recording with a click track or metronome blasting in his head.
We normally use very loud headphones for the drummer..so he can hear the click over himself.

A lot of drummers resist, but once they do it a couple times they see the difference it makes

How we do it-
-Create one measure of drum click by using event list to insert C#2 channel 10 (sidestick) on the 1-1-0, 2-1-0, 3-1-0, and 4-1-0 of the first measure.
(I use the sidestick because it cuts thru in headphones) -
-use 127 for velocity when creating the notes
-hilight the whole bar and copy it.
-Paste it, using the 'repitions' checkbox to set the number of nars to match the song.
-Assign the VSC DXi to the track, right click the track and auto convert it to audio on a blank tarck.
-turn off the midi track and hilight the new audio track.
-go into DX FX area and put PGPeakLimit on the track so you can make it as loud as you need to by pushing one slider up.

You should have a click in perfect sync with RD and one thats loud enough to make the drummers ears bleed, which in my experience is the correct volume to get them to even notice it, let alone pay attention to it!

I do not work here, but the benefits are still awesome
Make your sound your own!