I have a similar conundrum, as my A Race this year is an endurance event.
After listening to a lot of TR Podcasts and Dylan Johnson (YouTube) I settled on the Tues/Wed & Thurs approach. Threshold and above on Tues, SS on Wed and endurance on Thurs. I’ll then throw in a 30 minute primer on Friday, if I’m racing on Saturday. Sunday is long endurance ride which is nice and slow.