this is my 3d attempt to post - keep getting kicked out

went trolling for the first time yesterday (fri.) rough day on the lake 50 fow. i use a mini troll with a 5lb ball.
my issues were my ball would flare out from the back of the boat i running 1.6 mph assuming i'm not getting an accurate dept. my line would not release from rigger line. however, i did manage to boat a 27" 9lb walleye, i can't really take credit for it for it could have been on for sometime and getting it in was not pretty - reeling, cranking, netting all at the same time - it wasn't pretty.

questions
is my weight to light
am i not cinching down tight enough from rod to rigger line
is my release (gator medium) looping line to attach not correct.

help