I have an intermittent fault with my 3.2 petrol non-turbo 2009 XC70

Every now and again it will crank for a long time before it will start.

I have replaced sparkplugs, coils, fuel injectors, fuel pressure sensor and cleaned a load of sensor connectors.

I'm wondering what to look at next.. and wondering whether it's worth buying something like the below:

https://www.ebay.com/itm/17297258208...cAAOSwUIxbyYzJ

Would the car record any instances of long cranking and offer some hints as to what may be wrong?

The car sometimes hesitates at lower revs under power (going up a steephill) as well.