High frequency SAADC sample with Softdevice

I'm using an NRF52840, SoftDevice s140, FreeRTOS, SDK 15.3.0.

I'm trying to sample my ADC at high speed, >1khz (10-40kHz).

I implemented the logic from the SAADC exaple, using PPI and nrf_drv_timer, and I managed to set the speed of the trigger timer in the range of microseconds.

But with the softdevice enabled, the timing is very inconsistent and inaccurate. I have read a few comments confirming this, but can't figure out what the alternative is.

What options are there for a high speed timer used in conjunction with the softdevice and freeRTOS?

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