Now that I am safely removed from any expectation to know what I am talking about with boats, I am happy to throw a thought your way. (not a true goon rigger any more, just a broker)
Shifting weight aloft on your boat by 50lbs will make no damn difference at all.. You may notice if you are really really perceptive some difference in the pitching motion, heeling angle, or otherwise on the boat - but I bet not.
40' and 20000 is not particularly heavy, but I still feel that 50lbs used up at 1/lb a foot doesn't matter. You could remove something like 50lbs by changing to dyneema rigging if you are really concerned.
Tell us a lot more about the boat, a lot more, and your NAME - if you really want some help deciding on what to do.
Also, you might be so kind as to consider changing your username here, but that's just my vanity asking...
