Jacking plate dramas

Hi, wondering if anyone can help me. I have put a 12" hydraulic jacking plate on my 2013 Alpha 211 hull id LJEO2262L213 i am now having some problems i will start by listing problems 1.porpoising at low speed up to 30mph/i feel if i could trim in a little bit more i could stop the porpoising . 2.cant get the lift at high speed boat feels like its bogged down i can get the boat up but i have to trim out twice as much as before but still does not feel right. 3.hole shot i when fully loaded not great.I have tested boat in all possible trim and lift positions sometimes it feels close but not right i also spent 4hours testing with mercury racing,trying props and went best with the prop that is on it temptest 27 tried some 4 blades they never had a 4 higher than 24 pitch as stated i bought a 12 inch bobs hydraulic i did not realise that my old plate was 10 inch until after i received new plate i did not realise they had changed the hull on 211 as i live in australia it is a bit hard to exchange.The jacking plate cost $2000 and $2000 to fit hence why i am reluctant to change it.There is only 30 legends in australia and only 4 211s none of the 29 legends have hydraulic plates so i cant get a lot of help at home. You may be thinking why fix something thats not broken? i fish alot of shallow tidal water and a hydraulic plate is a huge advantage hope some one can help or have i stuffed up in getting a 12 inch plate cheers mike

What prop?

prop is a temptest 27

I have come to the conclusion that i have changed the centre of gravity in fitting the 12 inch plate and will be putting the old plate back on.

Return the 12" hydraulic and swap it for a 10" hydraulic...

asked bobs if they would do that but no response

I have a 2013 Alpha 211DC with 2 power poles, 10" Bobs Action Series Jack plate, 25 Fury prop worked on added a little cup, I have no problem getting up on plane, wot 75mph by myself at 6000 rpm. Hope this helps.

You never said what motor youre running, prop to pad height, water psi, etc.

great numbers coops if only i had got a 10 inch i would be loving life as i am in australia its is going to be a expensive exercise bobs wont even reply to my emails im going to have to ring i would still love to have a hydraulic plate but the right one

motor 250xs prop blue printed 27 tempest height and water all good the extra 2inches of set back have turned the best boat into the worst

motor 250xs prop blue printed 27 tempest height and water all good the extra 2inches of set back have turned the best boat into the worst

I believe boat guy is in pretty good with Bob's....Send him a pm? It's worth a try...

Call Tim st SMI Marine in Louisville KY. He is extreemly good with performance setups. He has helped me on more than a few occasions with any type of problem I've ever had.

Sounds like you are trying to run it too high!

How many RPM's are you turning wide open? Could the 27 pitch be too much prop?