Mine grow slow, and wide. 3 plants have covered the entire back of the garage. They are no more than 30" tall. Very pretty, very controlled. My secret? They are in total shade.
I know they are a full sun plant but I have discovered that a shady garden can grow some things just not as fast, or without flowers. If you are growing them in full sun, maybe you could shade your philodendrons some how?
Here's a pix of my split leaf philodendron, dogpack-go the the plant database for more information. However the philodendron list is quite long with many varieties.