which part of malaysia are u looking at?
pekan (east side) 3-4hr drive from singapore has the occasional good sized GT.
but we mainly run PE 1.5 gear for light jigging there and PE 3 gear for popping.
most Gts there are 2-7kg with the occasional bigger 20kg and the rarer 40kg GTs.
Pulau Jarak is extremely far from Singapore but has slightly more and bigger GTs than pekan.