RE: Stretching a fuse.... what effects are generated?
@ 1.62" you will barely be able to notice the difference. What you may feel is a little more tail authority and stability------I think you'll like it---------IF you can tell the difference at all.
Do keep the CG at the same position as before and change it only to gain the flight characteristics you want.
All the foregoing is based upon the assumption that all else has remained 'as before'.