Well I could get if to do it if I wanted to
But saying this it never did it when the engine was trimmed correct for the conditions.
Dont panic, have a play you will soon feel whats right.
Start in calm conditions as once their is some chop you change your trim not only for the load/speed but for what the waves.sea is doing. Keep this out of the equation for now.
Trim is a thing that needs to be learned, and all too many people dont learn it to their loss. Once you learn to trim a RIB propper you can be doing 25kts in in conditions that others that dont understand trim are bouncing all over going 15kts.
As far a bigger boats & trim, well i never move the trim on my 7.8 is best fully in for all conditions. Have tried many positions but makes almost no difference.