Hi,
a single MOSFET has no risetime ... it needs a complete circuit to determine risetime.
Usually shown in the datasheet(s) they specified the risetime.
If you look carefully you will see that you need a very fast and precise gate control to achieve a fast MOSFET risetime.
I would not be surprised if the "test circuit" for the risetime in the datsheet shows a several 10,000.00 $ signal generator to create the gate drive signal.
And I assume your gate drive signal needs to be faster than the MOSFET output signal (10% to 90% voltage) ... here I see the problem for your self made high speed MOSFET circuit.
If you want us to check the datsheets then give a link to them.
Klaus