Gear upgrade for Downtube FS8
What combination of rear derailleur and shifter do you recommend for a desperately needed upgrade on a DT 2008 FS8? If not too much to ask, could you give me the exact make and model as well since I'm pretty confused about all the options. I'm fine with keeping it 8-speed, and I'm looking for a combination some of you might've had success with on your Downtube FS.
I've tried the hanger straighening/youtube video method offered by Downtube, I've had a local bike shop(reputable one) do a gear tune up, but my shifting problem persist. Not sure if it would help but the shifting problem exist between 3~6 with 4th gear being the most problematic.