There's definitely something wrong. Hard to say what though with so little to go on. I've achieved better results than you're reporting with the bottom of a soda can stuffed with fiberglass insulation. I've also used the more conventional pressurized soda can stoves. Typically they generate around 350 watts which will bring a half liter 0f 20C water to a boil in about 8 minutes.
I can't say that I've ever used Heet. In fact, I've used Kleenstrip denatured alcohol exclusively. Not by choice. It's what happens to be available at the hardware store. I think this brand is a half and half mix of methanol and ethanol.
What about ambient temperature? Some (but not all) users report poor performance in cold weather. If you can post photo's of your stoves in operation that might help.
I don't know what temperature your water started at, but as you can see from my numbers, 7 minutes to 190 F isn't out of line. Are you sure you're measuring a full ounce?
Anyway, what I like about alcohol stoves: extremely light. Safe, clean fuel. If you spill it, it goes away by itself leaving little or no residue. That's especially nice if it leaks in your pack.
What I don't like: One of the slower ways to cook. Low energy content of the fuel offsets the lightness advantage. If I'm going for more than a day, I cook on my wood stove and don't worry about running out of fuel.