Join Date: Aug 2009
Location: Lakewood, Colorado, USA
Model: '06 GL1800
Is there any chance that you have a heel/Toe shifter on your 1500? (some of the travel in that linkage can be suspect and not allow you to firmly get it all the way into 1st (or just running into the case-guard with your toe sometimes)
Aside from that, or other limitations or loosness in the shifter - I've got nothing 'external' to add...