What kind of bark are you extracting from? Mimosa? Acacia? Phalaris grass etc etc? If anything other than mimosa, a mini a/b is usually necessary as any impurities (NMT, plant fats, and oils) can prevent DMT from crystallizing properly.
It is a bit unclear from your post because you say you were doing Vovin's (which is an a/b) but didn't mention any acid step. This is okay if you went straight-to-base instead by adding your lye solution directly to your bark. If you went straight to base or did an (implied) acid step you should be good.
At this point 450ml is still too much solvent, especially if it isn't very saturated (bunk bark, perhaps?). You may need to reduce the solvent even more and leave it be for 24-48hrs. If procedures are correct and bark is of decent quality, you should get SOMETHING out of it.
New to The Nexus? Check These Out:
One Fish Two Fish Red Fish Blue Fish