How many leads are in the fronts of the keys in the bass and middle section? If there is two or three you might be able to get by with one additional weight, preferable near the front of the key. You will need to take the weights out of the key back ends. I am thinking that if there are weights in the back ends then there are few weights in the fronts down below. Taking mass off the hammers is possible but I would go for thinning the hammers at a steeper angle than you might have now. I prefer to taper form strike point to tail end because doing so will control weights of individual hammers better. 50 grams balance weight is dangerously high. You need to get it down to 38 or 41 grams as high and 36 to 37 grams low end. BUT too much weight puts in inertia which you may wish to keep low. In that case you need to consider action geometry or putting in wippen helper springs. You can search the archives for such key words as metrology, Stanwood, balance weight, action geometry and others you may think of. Newton nhunt@optonline.net
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