I had to replace my anchor chain - probably 16 years old. Everyone at the dock said it was definately 3/8 size - but when I got the new chain I found that the old chain was 5/16 - so I am getting a new gypsy for my Lofrans Kobra windlass. I had been online and on IP forums and it seemed like 300 feet of chain was appropriate for an IP 420. So I purchased 400 feet of Acco 3/8 inch - 300 for primary anchor and 100 for secondary anchor (going to attach to rode) -640 lbs. Now my IP 420 bow is too deep and stern is lifting up enough to see the rudder. What is an appropriate length of anchor chain. I 300 feet on one side in the forward starboard anchor well. Do I need to pare back on chain or move some to the smaller storage chambers just behind the anchor well? I purchased a Rocco 33 as primary anchor. Thank you for your help.