You can un-pike the bow, too. Just add a few extra inches of length to each limb. With the limbs being longer, the leverage is more in your favor and will lower the weight.
Now, when you figure out how to add that wood back onto the bow, please post your process in the "How To" section because I am famous for taking off too much.
ok, for the serious answer: Yes, it's just like when you tillered the bow initially. But because you are so close to your final weight,
go slow. Make light scrapes and take an equal numbers of scrapes off each limb. Be sure to restring every time after taking your scrapes and "excercise" the bow limbs. This will allow you to keep an eye on the tiller AND re-train the bow.
Good luck with the project.