Kidmad,
My ride uses Plotong Wigra 1.6 14" sporkrim. Offset 9 9, so kena makat inemminent. Normally when I have full load of insurance policies in the car, when going over bump I will senget go wheel by wheel. Normally kena 1 side little bit, then the other side will be safe. I use front KYB oil base, rear GAP gas base. Sagat is bcoz of my rim offset, pretty sure any other Sabby original rim safe for 185/60R14. My tayar pressure is 34PSI front, 31PSI rear. Regular checking every Tuesday at Serdang Raya Petron.
After added slut bar, despite I go over speed bump senget, it first kena 1 side, then it kena another side also

Vibration may not be the closest term to describe, Malay word GEGAR may be more close to my feeling. I believe the road feedback is harsh without slut bar, it just that I didn't feel it as most of the gegaran being channel through chassis flex. However, with slut bar in place, majority of the road feedback has been directly reflected on the strut tower itself, thus I felt the gegaran as I went through uneven roads. Slut bar itself not only fix the strut flex, the bar itself will become like a noise conductive material, just like a guitar string. Have u experience the paper cup walkie talkie with string attached(don't know what it called)? U talk over the paper cup with the string being tensioned, the other party can hear your voice over the other side of the paper cup bcoz the string is vibrating the wave over. So, with strut bar on the car, that kind of effect existed by natural. It not only emphasize on the handling, but it also amplified any other feedback from the road. Be it related to handling or not.
I personally using slut bars for most of my cars, from Wigra to Iswaga, from Gancil to BiBa & Mybi, now BLM & Sabby, the most significant improvement after added slut bar was my BLM. Sabby 2nd to that. Partly bcoz Sabby was already well built, therefore I hardly notice tremendous improvement. However!!! On a BLM slorppy footwork, any bars added can felt like given a new life! I did slut bar on my BLM, whoah! Handling suddenly upgrade. I did rear seat brace on BLM, whoah! The car can drift. I did room bar & rear member brace, drexchan said thus far I'm the only unker who mod so much on a BLM.
I'm bearly complaining about the slut bar. So, don't misunderstand ya

I hope soon I get to see more in my Sabby as I try to improve it with minimal cost but maximum effect

haha okay maybe should spend sometime and sit in your ride to feel it. cause driving my savvy for so long i don't experience any of it. also the sagat you mentioned.. seems like you need to have a look into it man.. so any idea it's the rim or absorber? i think your tayar pressure is pretty normal. mine also normally pump 32 front and back lol.
yeah man.. i want to curi my mum's car go pasang the front bar and arb maybe. haha definitely will feel the difference... Now wait my Forte see how it handles first..