We will make it better. I don't know what speeds you were told you would see but I know we can improve on what you have. You are right about a few things.
The SCX lower will scrub speed and cause a few handling quirks but reliability is improved.
The sc lower will be faster, handle better, and break sooner. How much sooner is an unknown.
The SCX -4 is not a solution for you. Big prop with razor edges + young kids on a family boat = trouble.
I personally run the SCX upper and sc lower with 1200+ hp. So far I have had zero handling or reliability issues but I know my lower is the weak link. I have access to parts and I build the drives myself so I am willing to gamble on this setup.
I guarantee I can get you more performance out of your current setup but there will always be a trade off between speed and reliability when it comes to every aspect of boating. Or any go fast sport for that matter.


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