I knew my scope recommendation would be controversial. Are you guys saying that on DG with the typical scope of 1.5 - 5 that you keep it cranked back from 5x? Otherwise what would be the difference?
What are some ways of increasing the rifle weight besides the mercury recoil reducer (if that does reduce weight)?
Yes you always keep the scope on the lowest magnification while stalking DG. If it then happens you need to take a longer shot you can crank the scope up. After your first shot and whatever it is you shot at runs off you again crank the scope down to the lowest setting before follow up.
What would be the difference? Well at 4.5x minimum your field of view is seriously compromised for short range hunting. This is a big drawback when hunting DG especially on follow up.
Typical shots at DG would be from 40-100 yards on buffalo and 10-40 yards on elephant. What will you do with all the magnification except put yourself at a disadvantage?
The illuminating dot is great for low light conditions on Lion, leopard and even thick bush for buffalo.
The heavier the scope the more force is exerted on it under recoil.
Increasing the rifle weight can be done by:
Restocking the rifle with a denser wood.
Adding lead inserts in the stock by a competent gunsmith.
Adding mercury recoil reducer.
I have to mention here that proper stock design and fit as well as a high quality recoil pad is much more important than the actual weight of the rifle.