Damn dude, 4.1? Wow. I think you and I were about even when I joined here a couple years ago, 6-something. You're going in the right direction, I'm headed the other way. I'm actually at 9.4 at the minute but haven't updated here cuz it's painful and I consider it temporary . Hand pain gone, actually went to the range this week, 1st time in a year. So, I plan to throw down a 78 or so and be back under 9 by end of day, fingers crossed. Keep rolling.
No idea what my birdie conversion rate is, I'd guess pretty respectable cuz my putting never left me.
Welcome to The Sand Trap. There are a lot of good iron out there. We can each give you an opinion, but you should be the final judge. I recommend going to a shop or demo event in your area and trying a bunch. Three things to look at are performance, looks and fit.
Don't worry about mis-hits, just try them. Narrow down your choices to 2 to 3. Then, if you can afford to, go to a fitter and have them work with you to get the right shaft and lie, etc. you will not regret doing a fitting.