Over the past 6 months I've installed 2 drakes, both work great except for the fact that the waterspot is extremely low, unless you hold the handle down for about a half second while flushing. Well, today I installed a third Drake, and was shocked to see that it got the maximum water spot without holding down the handle. It seems the difference is that the fill tube flows at a much faster rate in the newest Drake than the previous two. Visually, there is no difference between all three toilets (ie, the fill tube is not kinked). Is there any way to increase the fill tube flow rate on the Drake?