So many experts hmmm
I really wonder what is realistic for you. In a duel, you would not be exchanging blows and blocking them, you wouldnt want to really energy transfer from your opponent at all, evading, parrying parrying doing the thing, of changing the direction while giving you a better position to hit, throw off your opponent weapon as well.
You could also half-sword for better control as well as make your long metal weapon not bounce around, but be stiff if you want to penetrate anything. Even if possible, you wouldnt want too long pike spikes. The vibration, the shock, the longer the piece of metal the worse the energy transfer, as you also get to absorb a lot of the energy from blows themselves. Not as important for cutting with big enough mass at the end, but dont try to pierce anything without a massive energy loss inbetween.
the shorter the penetrator piece the more of the hammer strike goes inside, not into me or as vibration and the ringing.
There are so much as in physics involved, you really do need to have both feet on the ground for more