Trim Tabs

[diver429]

Im thinking about getting trim tabs for my 1984 Seacraft sceptre hardtop with a 1999 200 mercury optimax on a armstrong bracket, can anyone make a suggestion on which trim tabs I should get for this boat? Also does anyone know what size prop I should be running for this boat. I have a 14 3/8 x 15 prop on there now and dont seem to be getting the rpms that I want. I m now getting 5400 wot at 35 mile an hour. And at cruise I get 25 miles an hour at 4600 rpms.I here guys getting the low 40s with the same engine on a walkaround. I cant see the hardtop slowing me down 7-8 miles an hour, I think its the wrong prop. Any ideas will be appreciated. Thanks Peter.