I have the same boat with a Merc 115 CT and I use a 19 pitch Mercury Tempest Plus stainless prop. It’s worked well since I bought the motor in 2016 and I’ve always been pleased with the performance. The part number stamped on the prop is 48-825860.
Agree ! I had the same ..That prop worked great. PS: I just got talked out of the boat in August and got considerably more than I paid for it new in 2016. 
My old boat had similar issues. The cord that connected the trolling motor to the graph. It wasn’t connected properly. By the trollling motor, there is an arrow on each connection. Make sure they are lined up. They will connect without being arrow to arrow
Thank you Dave!!!
I have been messing with this on and off since last fall. I read your post.. line up my arrows and BADA-Boom. I can’t believe I was so dumb!!
The dealers have the most up to date information. However, I can tell you, the factory is still fighting through supplier shortages.
T-Mac
Welcome aboard Terry. Glad to have ya here. 
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Thanks.. PS: Good seeing several familiar names here.
In 2016, certain models had the composite transom (Prov bass) Also in 2016 , 20 Alaskans were available with composite as an option.
For 2017 ..additionally..all models Impact and above have wood free transoms.
For 2018 and forward… No wood in transoms throughout the Lund line up.
T-Mac
