rescaling tension

[ANRPiano@AOL.COM]

I am attempting to rescale a Hazelton 5' grand I had asked you all about 
awhile back.  I am finding I am adding about 1500 pounds of tension by 
getting rid of the very high enharmicity in the bass.  The plate is of pretty 
heavy construction but still 1500 pounds strikes me as a bit much to add.  
Although I thought I once read somewhere that plates are designed to 
withstand 1/3 additional tension than they normally carry.  Would moving the 
bridge back be a better solution.  There is room and the back scale is fairly 
long considering the size of the piano.  I know it is convention time and I 
am not in a hurry yet, we have to refinish it first, but any help would be 
appreciated.

Andrew Remillard