Hello, looking for advice from experiences folk. I'm doing standard procedure: filtered water+sugar+coffee, on gas, mix, mix a bit more, leave for a while, wait for foam buildup, remove from gas, obtain foam, back on gas, second boil, turn off heat, into the cup.
However, in the process I feel like something is wrong. Here are my questions:
1. When doing in an electric stove it can take up to 10-12 minutes for it to start boiling. Does this impact taste negatively?
2. When on gas stove(high), is too quick boiling also causing negative impact? Or is it supposed to boil like tea on slow heat, taking 5 mins?
3. As you can see, before the foam builds up, we already have the crema. It blocks the top layer from any disturbance, so it boils underneath and practically errupts. Is that expected? That boiling raises the coffee powder to top, so when I'm grabbing the foam, it is mixed with coffee.
4. Sometimes, if it takes long for it to boil, I see how it starts caramelizing on sides(very dark buildup). Is that wrong?
5. Finally, the second boil looks wrong to me. As I bring it back to heat, it immediately starts bubbling on surface because there's no top crema layer anymore. It does build up the foam and creama along the way, but the bubbles keep disturbing and destroying anything that looks nice.

In the end I show the results in two cups. Generally speaking, often it feels like it takes at least 10 minutes from turning on the stove to spilling. I thought it shouldn't be more than 5 mins.

Am I doing this right?