Has anyone experienced a bank lowering the CL if the utilisation is not frequent?

The issuer surely takes into account many things, including how much credit one already have from other issuers.

Approve or rejected, you Will receive an e-mail. If approved then a sms will follow to inform that the card has been sent.

May i ask why you indicated Islamic Card?

Credit limit does depend on a plethora of criteria. A very high steady income from a credible source is a good start. Banks Will give as much as they think you can pay.

RM50k is a minimum if You have the Right credentials. But its an unassailable mountain if you dont.

A lot of premium cards starts from 20-30k.

Ok Bro. The major differences on an Islamic compliance card is that one can’t use it in several MCC establishments. Those dealing with gambling, liquor and various others.
As long as you meet the criteria, the ease of getting either is the same. At they end of the day, it comes down to
Your own financial credentials. I have both conventional and Islamic from Ambank and CIMB.

Imho to qualify for a RM50k limit, annual income of 150k to 250k would greatly increase your chances. This is with the proviso that all other aspects is normal.
Debt service ratio (DSR) less than 20% from your revolving credit limit is advantages. Some banks are more risk takers on certain people than others. There is really no one formula that fits all. Only thing is to try.