"back to size"?? It is to size, although that maybe a bit larger than you want. Weeping forms of dissectums can develop a very large spread with age. With a tree of this age and maturity (and inherent value) you may want to consider having it professionally pruned, specially if pruning J. maples is not your forte. It is not difficult to really screw up the appearance if you start hacking back without knowing what you are doing. Contact me directly if you wish and I can set you up with a real pro in your area that will do a superb job for a good price.