Mighty extensive kit you've got there! Sounds like a bug-out hospital, lol

I guess the most important thing is knowing how and when to use the items.

Modular kits have advantages and disadvantages... for instance, if you have family that is less well trained in first aid, it's great to open a kit and see "Bleeding Module" or something, and be able to pick it up with everything they need for bleeding in it already. On the other hand, that means you'll often have redundant items (although that's not a big deal unless it's an on person kit)

You might consider replacing the maglight with a surefure. They make a compact waterproof holder to carry a spare lamp and batteries too, and the combo would still weigh less and take up less room.

Also, depending on your climate, I'd check to make sure none of the stuff is heat/freeze sensitive since it's going to be in your car.

As for other medical supplies, I'm not experienced enough to say what else you need... but you might consider
-Asherman Chest Seals
-Abdominal Wound Dressing
-Israeli Dressings (you can apply them with one hand, which is good if you have to treat yourself)
-Some sort of neck immobilization brace. I forget what the more compact ones are called, but if you come across a car accident it might prove useful.

I know you're only asking advice on the medical aspect, but I imagine you have the general road emergency items covered as well? Like
-Emergency poncho (usually comes in a small, flat package like an emergency space blanket)
-1 Change of clothes (handy if you spill something on your shirt at work!)
-Mylar emergency water packets? (depending on climate)
-Fire Extinguisher, handheld
-More robust "survival" kit
-Road emergency kit (can of run-flat, flares, etc)