Since you now have a full version of Voice Attack I would highly reccomend you go here
https://github.com/cmdrmcdonald/EliteDangerousDataProvider and grab the latest release of EDDI, but wait until jgm releases his next build sometime today. With the fixes made since EDDI 0.7.3 its possibe that the problem your currently experience might have been fixed since then.
Ive made jgm aware of a situation where old events could still be processed by EDDI when they should'nt be, so, with his next release, this could also be fixed.
Have you tried closing Voice Attack before exiting the game and seeing if this makes any difference? ED takes up a huge amount of memory and resources, which, when closed, has to return back to Windows, this does sometimes cause a delay to Windows as your computer is suddenly asked to performs a huge amount of housekeeping tasks along with any activities your resident AV will perform on this sudden burst of file/disk activity. Me personally, I always disable my resident AV & Malware Bytes programs before running Elite to give ED a little more memory & resources to play with, leaving just my Windows Firewall active.
Will leave the remaing questions you've asked to jgm, as he is much more able to answer them than I.