I tried the adding and removing weight via the rear weight bolt and noticed that it makes a dramatic difference in how heavy the cue feels...My perception is that adding weight to the rear of the cue is actually heavier than adding the same amount of weight to the fore arem of the cue.
I am not a scientist, but I think it has to do with the leverage applied behind the fulcrum point..(grip hand)...The longer the length behind the back grip hand to where the lenght is applied, the heavier the cue will feel.
If the weight is added to the middle of the cue, the balance of the cue remains more in tact and this balanced cue will feel lighter than a rear weighted cue....(Just my perception)
I currently have a Jacoby (forward balanced) cue that is 19.1 ounce, but people that have hit balls with it will usually tell me it feels like an 18 ounce cue.....but because of its balance is very easy to stroke.....and IMO it is not even really the keeping the cue on line part that is affected....more so its the "timing" and fluidity of the stroke..
NOTE: Regarding playability, I have noticed that forward balanced cues take slightly more work to apply draw...(again this is my "perception")...So there is some trade off regarding CB action (rear balanced cue) and consistency of stroke (forward balanced)...(JMHANSO)