Exactly what props have been used? If they are lifting props then the problem may be the prop forcing the bow down. Jim is right, the prop angle may be part of the problem since an angled prop will lift the transom as the boat accelerates. 10S or 8S? Makes a difference on prop choice. The big Scorpion HK4035/800 pushed my 22 lb cat just fine on 10S.
Too, the Dumas hydros were not the best designs and are designed to be toss-launched. This technique could help the OP get the boat on plane.
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