I don't cast jigs but have been using an old one that I bought decades ago for bottom fishing and have been using out of La Push and it has been very productive on lingcod and halibut.
The photo of the jig is close to what I've been using. ****I don't believe that these are available in the 26 oz. size any longer.
https://www.evike.com/products/65622/Dimensions:
9 1/2" long
2" wide (at the widest point, in the middle......narrowing on both ends)
1" thick (at the widest point, in the middle.......thinning towards both ends)
Flat on one side......rounded on the other.
26 ounces
Reddish orange color
10/0 Treble hook
This has been used 30 miles out from La Push (600-700 feet) and has hooked both halibut and lingcod. The bottom must have been sand and gravel because I haven't lost it on rocky bottom structure. I think that it's made of iron and the 26 ounces gets down there and doesn't tangle with 2 lb. leads, if those are also in use by others on the boat. Bottom line: this shape and weight has been productive. Just passing along what I've seen work on the species that you are hunting.