instead of selling half, sell 1/4 and maintain the discipline. only buy back cheaper than you sold. or overload when it starts moving and unload the overload after it runs a bit.
these don't trade on valuation, they trade on group psychosis. that is what you are witnessing, isn't it?
if you feel bad about being ruthless, you are feeling and you can't trade on "feeling".
the first to the trough eats best. don't worry about getting fat.
"The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money."
(Alexis De Tocqueville)