If by "lifecycle funds" you mean target date funds, setting your allocation to 100% for your retirement year is the most reasonable strategy you can do.
But isn't that what the "lifecycle" target date funds do? The argument is that you will know the schedule you want to rebalance on for your custom personal needs, better than the generic target-date "lifecycle" fund will?
Sorry, I didn't check comments for a while. The target date funds tend to have higher management fees and yes, worse composition of stocks versus bonds compared to holding a mix yourself, IMO, based on your goals.