Gotta get this sorted out!

Now I need to start tweaking this carb a bit. I set the choke with a credit card size gap fully closed.It runs pretty good, but it seems like it's loading up at stoplights, the idle drops a few hundred rpm. Also sometimes when I let off from 40mph or so it's kind of sputtering.
I've never had a carb with four corner idle adjustment. What is the best way to go about setting it?
From the factory settings, I tried a quarter turn lean on all four and the idle went up, and i backed it down. It seemed like off idle response was quicker, but it acted like it wanted to die if I was coasting. I tried a quarter turn lean just on the secondaries and drove it 15 miles home, but it started losing rpm at the last stoplight, so I m moved it back to stock when I got home.
I don't have any jets yet , but where should I start to try and get it to run good on the street?
Sorry, It has been a long time since I messed with a Holley type carb, and I have much to learn.

Gonna go pull the #1 plug and see how it looks...