In defense of the Metzlers...when I sold my bike I had a little over 8,500 miles on them and (to me) I had plenty of tread still on them...but I ride like an "ol lady" so my experience may be different than from a lot of others on the board.
As for your thought of going onto the Avon's, I see nothing wrong with that decision. If anything else you will find out which tire is better and then make future decisions from there.
As for the Avon being "not as good" in the rain...that is the first time I have heard that one. The tire usually blamed for that are OEM Dunlops. During normal riding the Avon should be more that up to the task and when I change tires on my new bike I aim to put Avon's on them to see if I also can tell any difference. Each rider needs to buy the tire that he feels gives "him/her" the best type of service for the riding he/she does.
I do wish there were more choices however for the regular Rocket and R3T. The Honda Gold Wings are in the same predicament.
Dennis
20 dtg KAF
25 dtg Dubai
26 dtg Thunderbird'n time
140 dtg Dubai
141 dtg HOME for good!