Filtering by max value within calculated table

I have a calculated table that works something like this:

Var TAB1 = SELECTCOLUMNS(...

Var TAB2 = ADDCOLUMNS(...

RETURN TAB2

The resulting table is something like this:

I need to filter out the the lower summed level rows for each duplicated ID. (Never more than two occurences of each ID. And only 20 duplicates in a table with over 23000 rows. But I urgently need to remove these duplicated entries.)

The easiest solution to me seems to be to create a LEVEL_SUM column and then to filter out the rows where the the sum does not equal the max value for each ID. 

This of course works fine: 

Var TAB3 = ADDCOLUMNS(TAB2, "LEVEL_SUM", [LEVEL 1] + [LEVEL 2] + [LEVEL 3])

However, since this is all within the same code for a calculated table, the following will not work:

Var TEMPID = [ID]     # <= PROBLEM IS HERE! This is not yet a column, but a column expression.

As a result, none of the rest will work:

Var TAB4 = ADDCOLUMNS(TAB3, "MAX_LEVEL", Maxx(FILTER(TAB3, [ID] = TEMPID), [LEVEL_SUM]))

Var TAB5 = FILTER(TAB4, [MAX_LEVEL] = [LEVEL_SUM])

RETURN TAB5

Does anyone have any crafty tips to do this without creating a separate calculated table and without Power Query? This would probably work as a calculated column instead, but the problem is that I have to "wrangle" the data a lot more after I filter these rows out.