Switch to rack pulls on your heavy day staying at 1x5. Keep the full deadlift on Friday and switch to sets of 5. No point in doing triples on an 80% backoff. Don't do drop sets on your deadlift. Instead figure out how to get squatting again. VERY FEW people, an extremely minuscule percentage, can't squat. Fix your form, go to box squats, do whatever it takes.