Hi,
First thing that entered my head when I read your post was that perhaps you're now looking at the nav. instruments (particularly the RBI/RMI from what you've said) too much.
Remember, they're part of the scan - they're performance instruments - don't linger on them.
Also, when looking at the nav. (or com.) instruments try not to move your head, just your eyes. Try to keep your main gaze straight ahead of you, at the flight instruments. Granted, this is easier said than done and the fact that your ADF indicator is on the far side of the cockpit does not help, but you cannot take your eyes off of the AH for more than a couple of seconds (in my opinion!). Hope this helps. Best of luck.
Regards, GT.