4 point bridles adjustments HQ Salsa 2

[hqsalsa2]

I've this kite HQ Salsa 2 bought used some months ago and received it with untied bridles...
I found these sheets on the official website and searched online for info about bridles tuning and adjustments but everywhere seems common a three leg fixed bridles, here we have instead four legs (and i would like to know how are you going to tie them for example, i think i'm using wrong knots) and also how sliding knots affect the tuning because the kite also with strong winds doesn't stay in the air but stalls immediately and land... it's also very slow and unresponsive of the pulling... do you think I could convert this bridles to a common fixed three legs using the same length and start working from there? I mean avoiding the FL leg or also using a single line for O+A and leaving M at a fixed lenght instead of O+M and A at fixed length
I hope to have been clear enough in explaining... I'm losing hope in seeing it flying, i'm wasting a lot of hours trying to set it up

P.s. If there are problems with the image attached this is the link to the tech sheets
https://www.invento-hq.com/myfactory/CustomUpload/374O357O340O370O356O369O350O328O365O373O356O365O371O366O350O326O364O353O327O/116736_SALSA_II_RED_Technical_DataSheet.pdf

Edited Sunday at 04:57 PM by hqsalsa2
Added link