Address book lookup duplicates/performance

[nitro322]

I've been having an odd problem with this plugin for some time. As notes in other comments, since there's some renewed life in the project now, I thought this would be a good time to bring it up.

I use the Exchange contact folder w/ Global Address List to allow searching for contacts in our address book. In terms of finding contacts this works great, but there's a recurring pattern where after a day or so of normal use I start getting a pause with every name lookup, and after a few days those pauses are so infuriatingly long that I need to restart Thunderbird to get it usable again.

If I run thunderbird from a console and watch out, I see when it performs a look up and gets a result. Eg.:

1.@@@ displayName:Last, First, localId:ActiveDirectory:First.Last@domain.com

On a freshly started session, I compose a new mail and search for a user with a unique first time so that there's only one match in the address book. I get two "hits" showing in the console in the above format, though these are for the same person. If I delete his name and search again, I then get 6 hits. Repeat and I get 12 hits. I repeated this a few times and get the following number of hits with each name search:

2
6
12
20
30
42
56
72
90
110
167
182
210

I've let this go for a while before, and by the point I need to restart thunderbird it's returning thousands of matches for each individual, which is then multipled by however many users match that name (searching for bill, for example, returns many more individuals than the example above).

Any idea what's causing this? or what I can do to help troubleshoot so we can try to get it resolved? I've completed dumped and re-created my profile after each of the last two major Thunderbird updates, and the issue recurs every time. I love this project and the functionality it provides, but the performance hit is seriously wearing on me. I'm happy to provide whatever additional info would be helpful if you could provide some guidance on how to further troubleshoot.

For reference, I'm running Thunderbird 52.2.0 on Gentoo Linux (amd64) with the following extensions enabled:
AddressBookTab
Exchange EWS Provider
InverseSOGo Connector
Lightning

My environment is using Office 365, and I have to enable the "add global address list to search results" option to find contacts in our address book.