What I was attempting to point out is your set is most likely acting around 33 grams. That is the best running weight for most of these engines.
The idea is they will average out.
You can use a gram scale to weigh your rollers, and either remove metal or add epoxy inside to adjust your weights to save a few dollars, and fine tune what you have.
Lots of us have done this. You can also punch out the metal cores, and insert them into new rollers if the shells get worn.
Every bike is slightly different...