Continuing my front derailleur issues

The new Microshift front derailleur is not here yet, but I continue to
get greasy fingers.....

Yesterday, I abandoned the new Shimano Tourney derailleur and put my
old Microshift unit back on. Mr. Kunich suggested that I should try
moving it higher on the frame, which I did (thank you Tom).  With the
new 48t sized chain ring guard in place, there was no risk of pushing
the chain over and off the 50T ring.

Moving the unit down to where it was just over the 50T ring caused
many problems. With it raised up I was able to get it to shift up
smoothly from the 30T to the 38T. The shift from the 38T to the 50T,
worked now, but was very noisy and rough. It would down shift fine
from the 38T to the 30T, but the downshift from the 50t to the 38T did
not happen. I can achieve that by shifting all the way down to the 30t
and back up to the 38T.

It seems the problem is with the 50t chain ring. I have a good 53T
chain ring, which will probably work, but I refuse to be beaten. I
want the 50T dammitall. The new derailleur is supposed to be for a
50-39-30.

--
C'est bon
Soloman