I guess I'll just keep repeating the factual information.
The efficiency is the same pre-boil or post-boil. So the boil has no effect AT ALL on efficiency because sugars are conserved.
Now if you lose some wort in your hoses, that's your mismanagement, and has nothing to do with the boil. If you have to runoff more wort due to an inadequacy of gravity and have to boil the resultant volume longer, the efficiency of that wort is still the same pre and post boil.
Feel free to not take my word on it. Cool a sample of wort to the proper temp and measure the pre-boil gravity and measure the volume of wort. Repeat post boil (in the kettle). You'll find the volume x pts equal before and after the boil. You could boil it for a nanosecond or for hours and that will remain true. At some point you might boil off all the water which will make it tricky to measure the gravity, but it still would remain true