Switch to 3x5. 5x5 three times a week is too much - one reason I'm not a fan of Stronglifts.
Add another 25g of protein to your breakfast. My typical breakfast is 4 scrambled eggs in coconut oil or Kerrygold butter, can of sardines, and a big banana/greens/berries/coconut oil smoothie. You need about ~250g protein a day.
Originally Posted by Franklin's Dad
Did I also read that you're doing HIIT training on rest days? While eating at a caloric deficit? And trying to follow a total-body barbell strength training program?
Don't do that.
You can only ask so much out of your body at once. Stop the HIIT training on rest days. Once you exhaust your linear gains, work some conditioning into an intermediate program.