The two things that you are doing as stated are not a problem IMHO but neither will they assist in your efficiency issues.
First thing is the quality of crush, if it's too course your efficiency will suffer greatly
Second is temperature and control, if your thermometer is off and you are mashing high you will get a less fermentable wort so be sure you are using a calibrated thermometer.
Sparging volume is a third, if you over sparge you will dilute the wort, you would be better off using the 1-1.25qt/lb for your mash volumes and then sparge with the correct volume to hit your pre boil volume
Fourth is your hydrometer, are you sure it is calibrated? It should read 1.000 at 60f in water, if not then adjust your readings according to the difference
All of the above are typical issues associated with efficiency problems whether apparent or real. If you calibrations are off you may actually be at 75-80% and not know it. Generally if you are hitting 70-75% you are in a good place