I'm rocking salomon malamutes in the park, salomon's stiffest boot. The change is a bit large considering I was using some very, very packed out ride orions (read: opposite of what I have now), but I like the feel of stiffer boots and I will get used to it.
For jumps and stuff you should be absolutely fine with tight boots, if anything they will add support. A more flexible boot will give you a little more play when you land, which can be a good thing or a bad thing depending on the situation. Unless you like flinging methods out past your nose then stiff boots will be just fine. Jibbing is where you will run in to trouble with stiffer boots.