How can I avoid Loader settings from changing?

I'm using a lua script to create and initialize a loader, however, I'm finding that the Global In/Out and Trim In/Out settings aren't persisting to what I set.

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l.ClipTimeStart = 0
l.ClipTimeEnd = 31
l.GlobalIn = 116
l.GlobalOut = 147
l.HoldFirstFrame = 0
l.HoldLastFrame = 0

Has anyone had a similar problem and figured out how to stop the settings from changing? I tried to initialize all the settings at the same time using l:SetAttrs() but that wouldn't set the Global In/Out or Trim In/Out.