[Antennas] Tuning Jpole question

[Daniel Boyer]

   I just put up my first elevated external antenna... A 3/4" copper
pipe Jpole for 2m operation...  I tried about 15-20 different position
for the coax connection points and got it set at the point which gave
the best overall swr.  The results are that I have an SWR of <1.1
measured at 144.010mhz and an SWR of 1.7 at 147.990.  If I move the
contact points up, the swr goes up across the board, move the contacts
down and the swr goes up across the board.  My question is what should I
do to move the low swr more towards the middle of the band or just lower
it overall?  Do I need to chop some pipe off of the main  element or off
of the stub or something similar?
Thanks
Daniel
KC9DAG