The things to bear in mind here:
The more of an aspect the larger node already has, the less likely it'll actually gain that aspect from bullying. This will generally start to be noticeable around 30 size in an aspect, and the bigger it is the more diminishing returns you'll find.
This is a slow process, and is never going to be efficient, you will almost always lose some vis in the process. This is due to the bullying effect possibly removing vis capacity from the smaller node, and the point I mentioned above.
This process is usually done to make a node for energization, for wand/staff charging via the pedestal, many smaller nodes tend to be better as they will recharge vis quicker than one large one. If you energize a node, the CV/t the node makes in each primal is based on the square root of the capacity of the node in that primal (If you get compounds, they count for all primals they contain, but only the highest count actually works, so if you have 25 ignis, 16 lux node, the 25 ignis works for ignis, and the 16 lux works for aer, as the primal ignis is larger in size.) Bright nodes get a 20% bonus, pale get a 20% penalty. After this the resulting number is truncated.