Not entirely correct.
The Schaller has a slightly different baseplate geomentry, and needs to be mounted 1/16" closer to the nut as a result. This is why if feels a bit more "vintage" when using it, all other factors identical.
As far as the springs go, OFR /Schaller springs are about 25% "harder" and also have a slightly higher tension increase on extension. If you find them too stiff, try a set of "standard" V-trem springs. You will likely have to screw the claw further in (which will of course be a problem if you`re already hitting teh back of the cavity with it).
Alternatively, as has been previously stated, a shorter block will decease the leverage the springs have on the plate, resulting in a "softer" and more responsive feel. But that carries other (dis-) advantages with it as well.... especially if the back route is shallow and not angled.
BTW, Schaller still makes the Lockmeister (formerly known as Schaller Floyd or FR II) and OFR, Ping makes the OEM FRT-1000 and identical Aftermarket Floyd Rose Special in IIRC Korea.