I did pretty much the same thing OP did when I first got the saddle, ie: slathering it on, letting it all soak in, slathering on some more, etc. till it stopped soaking in in a reasonable time in a warm environment. Every few hundred miles I would slather on some more.

Then I read that this wasn't encouraged, for some vaguely described notion that if the leather got too soft it would stretch out too much. So, I've stopped putting new Proofide on for now, and I'll just have to decide at some point when it might be a good idea to put on some more. That being said, I did what I did, and so far over several thousand miles it doesn't seem to have done any harm.

edited to add:

This is what Brooks says on the subject.
A new saddle should be treated with Brooks Proofide leather dressing to help assist the breaking-in process. Proofide keeps the leather supple as it is specially formulated from natural ingredients to condition, preserve and shower proof your saddle. Proofide is the only substance that should be used to care for your Brooks Leather Saddle. Apply a little Proofide to the finished side of the leather. Allow the Proofide to permeate until dry and then polish off. Proofide should be used several times during the ‘breaking-in’ period and every 3-6 months thereafter. On bicycles not fitted with mudguards, an initial application to the underside of the saddle will be beneficial, this needs not to be polished off. The leather gets its colour during the tanning process and it is possible, therefore, that some colour residues will remain. It is recommended to polish the saddle with a soft cloth before first use.