Generally speaking, the really heavy Les Pauls have a lot of bright top end and a booming low end, and no warm midrange in between. There are always exceptions but it's true in most cases. That type of sound might be OK for grunge, or some other styles, but not the kind of thick, warm tones we like for heavy rock and metal.
In general, you want a medium weight guitar for Dino tones. In Les Pauls, that usually means between 8 and 10 lbs. If what you've got is too heavy, you get less warm, buttery midrange tone and you'll be fighting stabbing highs, and the booming lows.