In addition to checking the filament diameter and adjusting the settings accordingly in Cura as Sander said, I would suggest you begin with 100% flow rate, 0.1mm layer height, 50mm/s, 210°C nozzle temp, and 60°C bed temp for printing PLA, thus about the default values, and see if that works well.
Then you can try to manually lower temp to see how that affects the print. If you print slower, you can print cooler too (e.g. 20mm/s at 195°C), since the filament then has more time to heat up in the nozzle. And vice-versa. But I almost never had to change flow rate.
Expect a learning curve in finding the best balance between speed and temp for your models and circumstances; it may take some trial and error.
Thank you for your message and welcome to the forums!
'I'm using 3.0mm PLA with 195°c/65°c and 67% flow rate. I got this setting from my PLA supplier.'
Are you sure it is 3.0 mm, or is it actually 2.85mm? If it is 3.0mm there is a chance it is too thick and somewhere in the bowden tube or hot end there is added friction which can cause under extrusion. The Ultimaker generally uses 2.85mm. The internal diameter of the bowden tube is 3.16mm, so if there is some thicker area or deformation of the filament it could be enough.
If it is 3.00mm and there is no friction you can change the diameter of your filament in Cura from 2.85 to 3.00. If you use Cura 2.4, click the top right box next to Nozzle & Material. In the drop down, click 'Manage materials'. Select PLA, duplicate it and click Edit. In Edit you can change the name to PLA 3.0 and change the diameter to 3.00mm (I would recommend to measure it to be sure).
This would be a better approach than reducing the flowrate.
Your flowrate seems too low, and the temperature also seems kinda low, which both could explain the under extrusion. .. If the filament is not just too thick to begin with
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