Always having to re-level your bed? I don't think the problem is the springs as much as it is the way they were implemented. That X and Y wiggle room between the springs ultimately affects the Z, especially when removing hard prints. The main reason aftermarket springs are "better" is because they have a 4mm inside diameter, same size as the screw. This print achieves the same thing in 15 minutes and about $.02 of filament. The short one is for the back corner.
Give these a try before you decide to buy new springs. You'll still have to level your bed periodically, but it should be much less frequent.
These are designed specifically for the stock springs and stock build plate.