If you are starting at 4 degrees without the Ingalls 594 sleeves then I am guessing your RV sits for and aft level which is giving you about 4 degrees as opposed to the typical 3 to 3.5 degrees (without Ingalls sleeves) with a slightly nose down attitude.
You want to use the Ingalls sleeves set to give you the maximum available additional 2 degrees. If you are starting at 4 then that will result in about +6 degrees which is good.
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