You are not going to get any more length with 4 top versus 3.12 as your primary ball reaction from bowling balls these days is the surface of the ball and I would have to say at least 75% of reaction come from ball surface.
Top weight does not matter any more except for drilling a motion / balance hole as the more top weight there is in a ball the larger the hole is necessary to get it within the outdated USBC rules.
Also, Cg no matter, side weight no matter, finger /thumb weight no matter.
Put some polish on the ball if you want it to go longer and add surface to make it read the lane sooner.