Your bow is 50# @ 28", but what do you draw? My son's Kanati is 51# @ 28", but he only draws about 26 1/2". He's shooting 30" 1916's with 150 grain WW broadheads up front and they fly great for him.
I shoot the same arrow/BH (170 gr.) cut to 29.5" from my 46# Kanati, but I draw 28". I trim them to 29" for the 51#. The same arrows fly great from my 55# Mahaska LB, but they are a little light weight for that (505 gr.).
Unless you draw over 28" the 2018's might be a tad stiff. If your bow is center cut, it won't matter so much though.