Adding Jackplates?

[fastwhitecat]

I have a 30' Chris Cat with four 2.5 mercs that are mounted to the transom now. My question is, would jackplates help on a boat this size or not? My next question would be if they would help what set back would I go with? Thanks for any help. Tim

[Fish]

do you have a pic of the boat running? It might be helpful in answering your question.