Hello,Have you considered modeling your circuits in a spice simulator? That way you could see how all of the parts work together and make adjustments of component values without needing to build the circuit.
Many members here use LTspice. https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html
Diodes arent Gering any hot. Average current Is OK.1N4148 diodes are only rated at 100mA or so & the forward voltage is up to about 0.9V at 100mA; it will be a lot! higher when the peak current flows.
Try putting some Schottky or ultrafast rectifiers in those positions, something that has a low forward voltage at the peak gate current, when it matters.
Also, D1 & R3 appear redundant; those may be needed with transformer drive to prevent excess base current, but not with the emitter follower.