Is it paused at the beginning of the cut? What are you acceleration settings (machine settings) for Cut Parameters? If the acceleration is really low I could see this happening, because your power-on threshold is pretty high.
If you can go lower on Min Power, you should, as that might help, but you have a 150W glass tube - it’s intended for heavy duty cutting, not fine surface work.
You might be able to improve things by using Perforation Mode and setting small Cut and Skip values - like 0.2mm each. That will produce less overall output power, because it’ll be flickering the laser off & on, almost like dithering on a line.
You should also double check that you’re actually getting the power values you think you are. In Edit > Machine Settings, down at the bottom, there are min and max laser values. The manufacturer may have set your minimum higher than 10%, and those act as a hard cap - it won’t output lower than that minimum, or higher than that maximum, so check those. 10% seems low for a 150w tube.