Are Gibson Explorers neck heavy?
Explorers have thick necks, like a Les Paul, 24 3/4" scale also like a Les Paul so it will sit & feel very similar (to me anyway).
Can you fix neck dive?
Moving the neck side strap button to a better location on the guitar will solve 99% of neck dive problems without adding any weight to the guitar or having to swap out tuners. Oftentimes a guitar with a strap button on it's upper horn by the neck will balance like a charm once the button is moved to the heel.