I'm guessing that you probably did your temp rise test with the drapes away from the return air grill & the remodel problems sorted out so you still have a furnace temp problem.
All you've determined is that your limit is working on a furnace that is running too hot.
You can clock your gas meter to see if the furnace is overfired.
See if there is a higher speed tap to use on your blower.
Check the other possible causes of an air flow restriction that have already been posted here.