I use 1/80th and 1/100th jigs all the time . When it got to where I couldn't deal with casting my flyrods , I started tying up jigs that looked like some of my favorite flies . Especially the woolybooger.
I fish these on 2 or 4 pound test under a weighted float . Just cast , and slow retreive back in .
You'd be surprised at what I've caught on my tiny jigs . Last year I hooked and landed a nice LM on a black woolybooger and 4 pound P-Line . Gillchaser