Often you can get the same discovery time at 80% as you do at 20% - the difference being that at 80% your budget surplus might be 2 gold, but at 20% it's 20 gold!
So for example if you have it at 80% (1 more turn for completion of current research) you may have eg 20 turns till the completion of your next research while if you had your bar at 20% (also 1 more turn for completion of current research) you may find that you will have 30 turns till the completion of your next research.
Conclusion this tactic of changing the tax bar if you still have the same number of turns for your current research SEEMS to work but in actual fact you are just making your next research period last longer so overall there is no gain. I know that this is different in different versions.
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