If the bowl does not reach the floor when set on the flange without wax, then you may need either a lift or shims to raise the bowl over the flange.
You could also throw a layer of tile down and raise the floor level.
Or you might try another bowl that has more room underneath. There are plenty of bowls that will give you good performance now.
If the flange is high, make sure you are using a wax without the horn.
The Eljer Titan 4 is the same as the American Standard Champion 4