I don’t know about heat guns for vinyl as we use our Bosch for that too, but for tinting, its recomended you use a non direct nozzle, (look in the end of the stanadard nozzle and there should be a plate to fan the heat out.
For tinting a heatgun with the above feature and variable speed and temp is a must. If you are dry shrinking window film you need full heat and max power if doing it with water half heat and blower setting 2 (Thats on a Bosch 600 variable speed, cost abit more but often last better, cheaper ones tend to burn out quicker too, especially if you drop them o the floor when their hot 🙂