You can also download the PQ's directly from within GSAK straight into any database you want, dont have to wait on the email, etc. I sometimes use a temp database to download my PQ's into so I can then go clean them up (remove caches with to many DNF's, mark nano caches, weed out caches I dont look for and things you cant filter out in the PQ itself.
I generally use 4 databases: 1 for founds, 1 temp, 1 archive and my main one (default) where I store my active caches. I dont have to as it can all be done in one DB and use filters (views) to filter out stuff I am not currently chasing.
I then use an Oregon / Montana macro from the GSAK macro library which allows me to further manage the actual GPX file I load on my varying GPS's.
I've tried maintaining separate DBs, but keep coming back to merge them all together into one and using filters to see what I want (mainly because some macros won't work on multiple databases at the same time). If one hasn't delved into Filters (and then saving them for future use), then it's time to. It's an invaluable investment.
GE - if you don't know, you can double click on the colored numbers at the bottom of GSAK screen and only show that type (found, unfound, unavailable, yours). It is an immediate way to filter only those. So, you could double click on Unfound (white) and then go to GPS->Send Waypoiints. It will only send what is currently filtered.
Don't know the particulars about clearing the data on that model, but you would want to do that first.