Is it good security practice to use custom parameters above ?
Ignoring the standard is never good idea. You can't expect popular wallet software such as Electrum or Bitcoin Core to support it.
Even if you forget them, you still have your mnemonic seed and will be able to bruteforce address and PBKDF2. It can make your mnemonic seed more secure if someone stole it from you. Give you time to move funds etc.
I hope you have skill and time to write custom brute-force software which check generated seed/address on different PBKDF2 iteration number.