High Frequency current during starts can leak through some cables and torch parts, especially if they are dirty. Also if your gloves have soaked up sweat, that provides a good path for HF. Each person has different perceptions of feeling that, too. Some notice small leaks much more than others. Check to make sure everything is clean and dry. You can wash the handle and torch body with alcohol, or soap and water, but avoid stronger solvents.
Not sure about the pulsing, maybe someone else can point you in the right direction of what can cause that.
Long arc, short arc, heliarc and in-the-dark!