Fine tuning

Hi,
I working on some presets for Nanologue and have an issue with fine tuning of sliders.

It’s written in manual that left/right drags fine-tune but It still very difficult to get 0,5% or 0,8%. It’s important especially for pitch modulation as to create nice vibrato only small values sounds well. Anyone has a trouble with it or just me? (I use Ipad mini)

Cheers,
Piotr