Salamat datang, apa kabar Akbar, (that's about the extent of my Indonesian
)
Although your ping is very low I think it's your upload speed that's affecting your game play. It looks like you only have around 10-15kb/s upstream. You'll need to make sure nothing else is using it such as VoIP or IM.
Try setting the maximum clients to 2 (just you and your friend) and the bandwidth to about 10.
There's a table in the manual (Page 82) which shows how much upstream bandwidth you need per car.
"nkpro11\manualnetKar PRO Manual.pdf"
Server upstream requirements
cars, Required Kbit/s upstream
1, 10
6, 300
8, 560
10, 900
15, 2100
Failing that you'll have to both join another server hosted elsewhere.
Good Luck