Suspension Eibach drag springs too soft?

Nothing designed for drag racing handles well.

As far as I know, bilsteins are terrible with drag springs.

Is this with coil overs? If not, how do you know the specs?
If they are coil overs, MM uses 200lb springs for handling, so I doubt 300's are too soft.

If they are standard installation drag launch, they normally get an air bag in the passenger side.

Regardless, you have a mismatch in parts.

Gotcha, I read it as you had 10/300 in the rear.

MM isn't really a high pressure company, I think they like people to change 1 thing at a time to see the difference. Because when you change a bunch at once, it's hard to tell what made the biggest changes.

I must have talked to them 20 times and they never try to sell me anything.

I'd buy the street set of H&R rear springs they have (not officially sure which set they sold me)
I've had a bunch of rear springs and they are easily my favorite. Handle well, ride quality is easily the best of any set I've ever owned.

Also maybe get their pinion snubber, since it's shorter and softer if the rear is hitting it.