Short answer? Yes. The reason is that some people have reported that when they put all the extract in at the beginning of the boil they get "extract twang". YMMV
I usually add 2-3 pounds upfront for hop utilization purposes. I think you should gradually scale it back to see how you like it. Try just lowering the bittering hops a little and see what it tastes like. Then next time you'll know. All just my opinion so take it with a grain of salt.