I was gonna point out the same thing as the parent about the tips but figured that what you said must be true. Those existing tips were meant for specific power and whatnot… y’all needed to do your own thing to meet your higher, different specifications.
These 140w are peak power, only in specific cases. To have useful power at all times you need to perfectly match supply voltage to i-v curve of your tip. Which pinecil (due to its schematic) cannot do.