The key for doing Sheiko IMO, is to pick a proper 1RM, and to err on the lower end.
This time, you might have picked a good number for the squats, but perhaps a too high number for the bench and the deadlift.
Also, I'd say it's important to pick a Sheiko routine (there are several routines out there) that you're able to recover on.
Some of the routines are just too big and have too high percentages to fit a natural athlete.
JMO.
From what I know of Sheiko, I agree with you. That said, I've never trained sheiko, so I don't know from personal experience.
I pretty much follow a westside basic template----we recently dropped to 3 days a week because of work conflicts and to give time to recooperate from some nagging injuries. I'm hitting at least 20 lb PR's on each ME workout right now, so I'm doing something right.
We do planned deloads every 4th week if we are on a 4 day per week program, every 6 weeks if its a 3 day per week program (because of the increased time to recover). Our deload weeks are done two different ways: Most often we'll do a regular DE bench workout, but back off on the heavy "accessory" lockout work---declines, 4 or 5 boards, or reverse grip bench and cut back on speed deadlifts (none this week). We also only do the accessory work for ME days. For example on ME squat/deadlift, we won' do a squat or a deadlift movement, will do back extensions, GHR's and abs. Alternately, if we are all feeling good and rested and not wanting to do a Deload week, we'll do three workouts where we come in and work to a 90-95% max on squat, bench, or deadlift and then leave. No DE work, No, ME work, just those three workouts really focusing on form--trying to get it perfect.
Prior to a meet, I want to hit my openers two weeks out, although if I'm having shirt problems, or I feel like I need lots of rest, I'll go up to the Tuesday before the meet (ie squat and deadlift the week prior, but no bench) and work up to my opener. Then the week before the meet is for rest and recovery.