Playing with Hori Project Diva FT Controller

I recently got my hands on one of the Project Diva controllers by Hori (the one with arcade layout, ps4 ver.) and I'm having some troubles playing PPD with it.
I was able to set up all buttons except for the sliders.

The controller has this slide panel like the pd arcade machines do, but when i tried telling the game that this pad is for specified sliders, it didn't really work.
only small portions (~5cm) of the pad are for either right or left slide, they're really hard to catch while playing cause the registrating area is so small, and i also couldn't figure out how to play long slides, not even to speak of (same side) double slides.

does anyone play with the same controller or know of/how i can fix it?

i also noticed another thing:
when i play on ps4 controller circle also acts as right slide and square left slide, when i play on the hori controller circle is still right slide but instead of square triangle is left slide.
is there a way of playing a same sided double slide only with the symbol buttons (triangle, square, x, circle)?

thanks in advance! (*╹▽╹*)/