Ok I have a 21 ft pontoon.with a 60 hp mercury 4 stroke.. I was thinking of trying to troll. The boat is set up well with its design..I have trolled some with it ,with some success.. but I'm thinking I need to slow it down a bit more.. I can get it down to about 1.5 ..I was wondering if those trolling plates that mount onto the lower unit would help? Thanks in advace,I'm learning a lot on this site..any input would be greatly appreciated