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These things have been discussed to death in these forums. Those who favor them amount to about 1% of those who have actually used them. Look at it this way, if they provided any significant benefit the manufacturers would have designed the AV plate that way.
1)I am a firm believer that if there was a really good reason for it the engineers would have built it into it. Especially after all these years and different manufacturers.
2)Bushing and bearing killers. 2 friends of mine had the same outdrive, same year and almost identical hours. Only difference, 1 had a hydrofoil and his pivot bushing/bearings went bad at about 200hrs.
They do help keep the bow down. If you do a lot of skiing with a boat not purposed for skiing it may be something you want to consider. If not, Iíd skip it.
1988 Fisher SV-18GT Bass Boat
* 1988 Evinrude 90hp VRO
1982 DuraNautic 14' Offshore
1983 12' Lowe row boat
Various Antique Outboards
Various Antique Outboards
1996 Larson 226 LXI bowrider
* 5.7 FI Volvo Penta with SX drive
1987 Chapparal 187 bowrider
* 5.0 Mercuriser with Alpha 1 drive
I put a home made set on a 9.9 merc I have because I was running it on a boat with a 21" transom and the motor was a short shaft. I had only the one motor then and it was not very deep in the water. At a slow creep it was fine but once it got moving it would suck air. With the rig on the motor it would keep more water on the prop. It didn't take the place of a long shaft motor but I was able to use the boat.
So that entire subject doesn't need to be typed out again here's a link to a recent thread on the same topic. In your application it may help to get you on plane if used incorrectly, but its not what you need.