sfn: I can certainly understand you settled for two hits on Razoff. I did the same when I tried for the Razoff glitch the first time. It is a great feeling improving your score in BOM and it quite overshadows the frustration of not hitting him three times. You will be able to get it next time, no doubt about that.
If you follow the strategy 2-2-1-2-2, which we have talked about before, then you will have to hit him four times without the HMF before a new can appears. If you follow the strategy 2-3-3-3 a new can will appear right away. However, it is extremely hard to successively hit him three times.
It is indeed difficult to renew the HMF after the second to last series of hits, and especially so if the can is far away. In the case where the can is far away, I sometimes roll into the wrecking ball while it is destroying the can and renewing it that way. And then one has to rush back to be in position for the last series of hits. It's an ordeal, but it's doable. I don't have any special technique to make him delay the destruction of the cans. However, there are only three cans where you have to do that. It will prove to be an minor problem I'm sure.