Why are you eating so few calories? You really shouldn't push such a deficit for too long. Stay around 500 under maintenance and be patient.
Generally on a cut I feel I lose energy more than strength myself. I don't really concern myself with percentages but I'm definitely tired quicker and lifting less. When I go back to maintenance or a bulk my energy levels come back within a few days and my strength is right where I left it in most cases.
In your case though, I would be concerned about genuinly losing strength along with muscle mass at such a deficit.
If I remember correctly, you have the thread about the modified 5x5. 5x5 is for strength gains, adaptable to strength and mass gains, both of which require a caloric surplus.
It can be used to cut, any caloric expenditure leads to weight loss but you are going to crash with this diet on the routine outlined in that thread.