I suggest you use ONLY PLANES for your high-current high-speed-switched-current loops. And have no breaks in the planes where outgoing and return currents need to co-exist to null out the magnetic fields (which by the way reduces the stored energy and thus lets the circuit switch faster).

By the way, you need not allocate entire planes to the high-speed high-current loops. Do plan, with sketches, your high-speed components placement; select components with pinouts and backside solder-regions etc to minimize component heights above the planes (or regions of planes).

I suggest you use ONLY PLANES for your high-current high-speed-switched-current loops. And have no breaks in the planes where outgoing and return currents need to co-exist to null out the magnetic fields (which by the way reduces the stored energy and thus lets the circuit switch faster).

By the way, you need not allocate entire planes to the high-speed high-current loops. Do plan, with sketches, your high-speed components placement; select components with pinouts and backside solder-regions etc to minimize component heights above the planes (or regions of planes).

Regarding MOSFET oscillation, a "gate stopper" resistor is used to dampen ringing. Assume 10nH to 100nH (1/2" to 4" of wire, 10,000pF Cgate, and transconductance of 1 amp/0.1 volts. Lotta potential to oscillate, in Colpitts config.