Is this a fair tipping share policy amongst employees and Owner?

A friend has a coffee shop I occasionally help with and I came up with this policy to make it clear how sharing the wealth works regarding tips sharing. When two employees work the floor they split tips down the middle. When owner and employee work together employee receives 60% of fare and it is up to the owners discretion if they give back any part of their 40% to the employee based on owners participation. Some days it is non-stop and others sporadic. AND, most of the time the owner hands back a 5'er or ten'er depending on how he fills his participation was or if said employee really performed well.. Trust me, I have never seen the employer short change anyone. And, all but 1 employee has been on the job for 3 to 6 years so something works. However a new employee has an issue. They feel they should have all the tips when working with the employer and likes it better than splitting 50/50 with other employees. Base pay is $10. With even the 60/40 split, they average $14-17hr. There was a little misunderstanding I just found out with new employee on how it works and of course she feel it is not fair. Thoughts?