I have been using oil for our Shabbos table for many years as it’s a hidur mitzva to use olive oil (heard from Rav Sheinberg).
I have had wonderful results using the stiff wicks(medium to large) that are placed in the hollow metal shaft holders (used for the Chanukah menorahs). The flame never drops down and is always brightly visible no matter how much oil is in the cup and never an odor.
Actually water enhances the flame which is why it’s brought down in the sfarim.
First arrange these wicks in the cups; they will protrude a bit over the shaft. Pour the oil into the cups and over the protruding wicks (so that your initial burning is oil). Light one wick and IMMIDIATELY pour in the water to about a quarter inch below the flame, or to the level you desire (the flame gets brighter as the water level rises) and continue this way until all are lit.