Tiring in what sense?

I use my Vulcan as a mode of transportation to work , to and fro about 100km , mon - fri.  Not tiring at all.

It could be that you are still not used to the bike (460KM) and not familiar with the position of the foot pegs since you used to ride a kapchai before this.
Give yourself some time and you'll love it.

One thing I noticed about the engine is that the rev must be at least 3500rpm - 4000rpm.  Anything below that, the engine will vibrate.

How does the AHM mufflers sounds like?  Which type of muffler you using?  any pic?
I would like to get something bassy and solid.