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Well, two subjects are mixed in this thread. On the fuel mix I have no comment; obviously there is contradictory guidance, including from OMC.
on the 7.5, it seems you are giving lots of attention to fuel, but what about ignition?
Have you changed the condensers? These are a bit of a problem because (1) ordinary ohmmeter testing isn’t reliable; they need to be tested under some voltage stress from a proper tester (2) condensers deteriorate in storage with age so NOS ones are not always good; and (3) the quality of new ignition parts has, in general, gotten worse.
Is it cooling properly? Changing water pump impellers is a project on these and might be neglected. Likewise thermostat should be checked for proper opening.