If you've soaked for any period of time, I would dump it all in. You've made pretty much homemade vanilla extract if you soaked the beans. Thats why you've got to be a bit careful adding TOO much vodka. I've used bourbon, as it's already got a bit of vanilla flavor to it from the oak it's been in.
You can try adding the beans, and then half your vodka extract and then taste the beer. If you don't sense any harsh vodka flavors, add more. All the flavor will for the most part, be in the vodka.
Be sure your beans are cut and split open when you add them.. Give it a week and taste it..
Thank you. Could you recommend a substitute for the Pale Chocolate Malt? I believe my LHBS only has regular Chocolate Malt.