Sometimes the word “that” slows things down just enough to win your readers over. Sometimes it’s essential for clarity. Removing redundancy is a reasonable aspiration but if your ‘that’ is helping the rhythm it ain’t that redundant. Roll it over your tongue and decide how terse or rhythmical you’d prefer to sound in each instance.
Pause to consider how you might creatively join two short sentences thus adding to the flow, the rhythm, perhaps making the difference between seductive prose or perfunctory note taking.
I think it is fair and even modest, more Obama and less Trump, to preface your opinions with phrases that illustrate your humility and remind ourselves that my truth might not be yours.
Just kidding. Sort of.