Calculating a Rank with Time Filters

I have a few measures that go into creating a Rank of a performance score for each person based on numerous performance scores received over the course of a year. I then created a measure that will display the selected person's final ranking in a card: 

var _Table = summarize(filter(all(People),People[Test Count]>0),People[Name],"Performance Rank",[Performance Rank])
var _Slicer = selectedvalue(People[Name])
var _rank = filter(_Table,People[Name]=_Slicer)
return
Maxx(_rank,[Performance Rank])

A couple of notes: The Performance Ranking has to only include people who have actually had performance reviews, so I included the People[Test Count]>0 in the summarize function to account for that. All of this works perfectly...until I filter by date. 

In my Performance Ranking Table which contains each person's rank, I can successfully filter by date to see the Ranking Table for January through March, for example. However, in the Card Display measure above, there is an issue. The summarize function draws from a calculated column for [Test Count]>0, which is static. Therefore if I filter by January through March, that summarize function will include people who didn't get reviewed until April. Accordingly, the value displayed in the Card for a specific person is different: 

Person is ranked 21 out of 23 in Jan-Mar. However, if you were to include all people who eventually got ranked, this person's rank for Jan-Mar jumps to 47. 

I've tried a couple of ways to filter my summarize function by measures for dynamic Test Count>0 and for dynamic Performance Score<>blank. These don't seem to produce the desired result in the virtual table. 

Any ideas?