If your broker gives you RM8 flat fee as brokerage fee, then there is nothing wrong with your calculation. Normally brokerage is by a minimum and as the transaction gets higher, it is based on % of transaction.

Like some brokerage in Malaysia charge a minimum of RM40 or 0.6% (whichever is higher) for broker assisted transactions but for online transactions it is only RM12 or 0.42% (whichever is higher). 

So like if your brokerage gives a flat rate of RM8 which I doubt, for any amount of transaction, then your calculation is correct. Most have this % brokerage so they can 'untung' more from bigger transactions. Imagine RM8 for a RM1 mil transaction, a bit too generous right? So check what is your broker % brokerage fee and calculate if that is higher than RM8, if it is then it should be the correct fee.

Par value doesn't matter at all. Par value on as a reference of how much a stock has split and also used as a reference for dividend payments. Basically doesn't hold a lot of importance. Par value is not used in transaction costs calculation whatsoever.

Yup that's right.
All stocks when they are listed are by default listed on a par value of RM1.00. If they split the shares, it'll split the par value accordingly.

A lot of sifu here already suggested that the par value should be removed completely from Bursa. Because there is no need for it and will only confuse people.

I think SG market and USA also no such thing as par value anymore. Not so sure about that though.