3/8oz is way too light. You need a tiny Bass baitcaster to move that well. Get a Tady 45 that you don't like, cut off the hook and head down to some local football field.I was just at a tackle shop asking the same as OP. They recommended an Okuma Cedros Star Drag Reel. I asked the shop employee "what are you using for surface irons?" he said an old Newell and he does not know what he will do if it ever breaks and that nothing casts better. So I went and found a NEWELL 229-5 and mounted it to my new COUSINS CJB 80M-CT (holy heck this stick looks amazing and if you ever get a chance to tour cousins go do it its rad). I tried casting with a little 3/8 oz in the alley at my house, but did not have much luck. Either the rod is to heavy or I need new bearings in my NEWELL, or I suck.
If the Newell has good free spool and you can't huck that a mile on your 8' jig stick its on you!
If the Newell has bad free spool you need to crack it and get some oil in the bearings etc.