Kid, I absolutely friggin love your no-nonsense work attitude. You are going to go far as long as you keep your head down grinding and learning both. You cannot get the best of either one without a lot of the other.
Anything where you are projecting yourself off the ground is ballistic or projecting a weight away from you in the air (like med ball throws or barbell throws) is ballistic.
I would very, VERY much head Coach Thibaudeau's advice on being very sparing with the plyometrics--and loaded jumps fall into that category more or less. Don't keep them in all the time and don't overdo the volume.
People either tend to do the loaded jumps before heavy work, on their speed or dynamic effort day (if they have one), or as a super set with heavy lifts (e.g. set of squats, rest 90 seconds, then 3 loaded jumps, rest 30 seconds, squat again). They typically use loads between 15-30% of their squat most of the time, and heavier is NOT always better in this case. I think it best you should be thoroughly warmed up and blood flowing before doing them and should--for the moment--not do them as a contrast super set. If CT has a differing view obviously cede to his opinion.
Also, you should be very happy with your .4 sec improvement in the 40 yard dash in 6 weeks. That is HUGE. I know you're impatient but slow down for a second and you'll see that's basically 10% faster than you were 6 weeks ago. Give it time, it will come. The first 10 yards is important, but more important is your 40 yard time. 90 feet is 30 yards, not 10. This means as long as your 40 yard time is improving your speed to first is also improving. Obviously don't give up on improving your explosiveness off the start, just keep in mind you are still getting better as is.
My advice is to make sure you get good glute and hamstring work along with your squats but it seems you are doing that already. Just remember "go muscles in the back, show muscles in the front".