Dunlop hasn't made a "must have" tire in any category, ever, that I know of, and neither have most of the brands I boycott so your not missing out on anything.
I only recall one set of Dunlops that I had over all the years. Dunlop Radial Rover on a Ford Explorer. I had constant balance issues and actualy bought the "lifetime balancing" from Firestone. I was back almost monthly.
Finally gave up and bough the Michelin LTX M/S and never had to have rebalanced until it was sold a couple years later.
The Dunlops were the #1 pick on Consumer Reports at that time. LTX was # 2 but mostly due to price premium.
I do a lot of searching and test watching before I recommend and buy. TR, DTD, BITOG, CR and other tire sites.
I commend you for looking and asking thoughts, I have no clue what profit margin even is. Location of your business would impact choices. Many local places I have gone didn't carry much inventory but were normally able to get what was needed same day or next day.
I tend to wind up at the Costco often due to the sales and I'm there shopping. Sam's and BJ's offered more more choices even if they had to be ordered. Costco all I saw was Michelin, Bridgestone for the most part. BJ's listed the other day when I looked Nokian, Continental and they always had BF Goodrich, Michelin, Bridgestone. I got my Pirelli's from Sam's which was good as they include road hazard etc also.
Look to be on the list as a "recommended Installer" on TR, DTD etc. Maybe invest in a Road Force Balancer if possible and train on proper use. Customer service is key. I started using a local place for my installs on tires bought from TR and DTD. They were on the TR recommended and have the GSP9700. Small place, always busy, they do have a decent garage/storage area and carry General, Nokian and some others but can get what you want on order. They also have an area with some used take-offs with decent tread. They seem to get used/rotated pretty quickly. Many can't afford even an extreme budget low tier and are struggling with 1 used. It is what it is and again they are always busy.
I had my 3 bent rims fixed by going there. Whatever service places they are connected with. I dropped them off 1 morning, next afternoon they called and said all done for $105 per rim.