The issue for me is that the first interval always feels easy, in that case I only reached max effort in the last 30s or so. I also paced it, otherwise I would have gone out at 400w for the first 2 minutes and then failed the session, like I have already done in the past 
. My 5min power is 356w for reference.
About the recoveries I planned them that way, like I go from 1x to 2x the duration of the work intervals as I need. I won’t take a 15 minute recovery or something like that of course. I also take them as easy as possible until I feel ready to increase the pace slightly, as you can see from the graph.