And contrary to what may be intuitive, try your brighter jigs on brighter days and darker jigs on duller days.
I also stocked up on Yamashita jigs while i was working for Shimano. A bloke in the local warehouse was telling me i was a snobby wanker buying expensive jigs when plenty of locals are happy with the $2 jobbies. I got back to work on the following Mondays and said, "hey, you know why i bought the more expensive jigs? first cast, squid, second cast, squid, third cast, squid....". Also, my Yamishita jigs haven't rusted in years and the $2 ones have literally fallen apart and rusted to bits in that time.
Weed beds, reefs and rocky cost line but weed is good..... Squid is great bait but better tucker!!!