Thanks for the advice everyone.
@Shellshock
At this point, being able to read the books in 10-20 years not really that important to me, as I only read books once and then I'm done with them. And if I can get 10 years use out of my 505, I will be quite happy and definitely feel I got my money's worth out of them!
So, for now I think I will keep the LRF just because it's already there, and also since I like the idea of a straighter margin.
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