Try 1/2" line, 2 types of anchors and a sentinel
For my H29.5, I have 150' and 300' lengths of samson super strong anchor line as well as a 20 lb Danforth Hi Tensile and 25 lb CQR. 25' of 5/16 hi test chain is on the danforth and 13' of 3/8 chain is on the cqr. I also use 3/8 stainless quick links so I can switch anchors and line easily. A sentinel is a weight attached to the anchor rode which keeps the pull more horizontal and, more importantly, prevents keel wrap, which occurs when wind and tide combine to turn the boat, wrapping your anchor line around the keel. The sentinel holds the line below the keel and also cuts down on "sailing" at anchor. This combination gives me options for nearly any bottom or depth I would encounter in Southern New England. The Danforth works well in mud and sand; the cqr works well in other bottoms.If I were doing it all over again, I would ONLY buy New England Ropes 3 strand line, which Practical Sailor rated superior in chafe resistance. I use a chafe guard at the bow roller right now.