I think it comes down to how much you want to go for that ONE fast time. As someone else has already noted, you probably won’t be able to race, do the 4X30+80+100+120+150 and be at peak on time for the 22nd.
It appears that you need 2 weeks after a contrast session to get optimal benefits for racing, but 10 days should be enough for an improvement. And if it’s your last race, you would have all offseason to recover if you did get injured (it doesn’t appear anybody that has tried it this summer has gotten injured). I would probably go this way simply because it fits better with your schedule for the 22nd meet.