Many thanks to all who replied.
The 1RM weights I use for the Smolov are 320 for DL and 275 for Squat
I don't do Smolov all the time but I wanted to try it one time start to finish as written so I am trying to be as precise as I can be (including the 4 squat days per week)
I brought into account the amount of food I will have to consume but maybe my sleep patterns (4 kids, wife, work) aren't adequate...
Anyways I think I will take this advise from Matty:
And of course (already re-started) foam roll and stretching
I think I will replace the DL with a superset of weighted pull ups and shrugs, sounds good?