No not at all. You are confusing rest interval with pace. My suggestion is to keep the same interval throughout, maybe take an extra 30 seconds or whatever gets the clock on top or bottom.
If you have done a 1;40 to 1;26, that is a good template to follow. So if you really are not that fast right now, start the first set at about 2;00, and descend to mid 1;30's. It doesnt have to be 5 seconds each 100, but something in that neighborhood. Just not 1 second.. The purpose of the set is to have the first two of each set to feel super easy, and #3 hard but steady. #4 is a controlled sprint. As you do the four #4's, maybe sprint one more lap on each one, until the last one where all 4 laps are all out. So first one is 3 hard, steady laps, sprinting the last one. Second #4 is 2 laps hard steady, and 2 sprinting, and so forth. That should get you a good descend on all the sets together, as well as within the sets themselves.
Nothing will be so hard that you are not fairly fresh starting the next interval, except #4. But then you get to cruise again and recover, which should have you in the 1;20's at the end somewhere..
If you have done a 1;40 to 1;26, that is a good template to follow. So if you really are not that fast right now, start the first set at about 2;00, and descend to mid 1;30's. It doesnt have to be 5 seconds each 100, but something in that neighborhood. Just not 1 second.. The purpose of the set is to have the first two of each set to feel super easy, and #3 hard but steady. #4 is a controlled sprint. As you do the four #4's, maybe sprint one more lap on each one, until the last one where all 4 laps are all out. So first one is 3 hard, steady laps, sprinting the last one. Second #4 is 2 laps hard steady, and 2 sprinting, and so forth. That should get you a good descend on all the sets together, as well as within the sets themselves.
Nothing will be so hard that you are not fairly fresh starting the next interval, except #4. But then you get to cruise again and recover, which should have you in the 1;20's at the end somewhere..