[colicoid]

There are several problems with your approach i.m.o arnthorsnaer.
First of all, its stressful. All it takes is an extra long toilet break and your daily planning is out of sync and has to be updated which creates a larger need to micro manage your tasks. It is very hard to estimate task durations.

The idea of GTD is that all your tasks are to be looked at as optional. You do the ones you feel like doing and you forget about the ones you can't do right now. The context mode is like a menu from a fancy restaurant from which you can pick and choose as you like. Thats how you reduce stress. The only exception to this are the hard dates. Hard dates, like toadling stated, has to be done.
As such, there is a huge difference between a starting date and an ending date. The starting date is liberating because it takes your tasks off your radar. The due date however creates a stressful commitment that you must adhere to. Think twice before you set due dates!

To further take stuff of your radar, and perhaps even concentrate on only what you intend to do today you can use reviewing and put projects on hold and possibly combine the two techniques.
You could for example mark everything you don't intend to do today as reviewed. That would leave you with a daily task list when you are in review mode. Some people also use flags for the daily stuff.