Bip39-Master Default range of iterations used in wallets is 2048. Escalating this range must help it become safer versus brute force attacks, nonetheless you will need to retail outlet this benefit. To accessibility your wallet with personalized PBKDF2 you'll want to use this script (or similar) to compute your BIP39 https://webnowmedia.com/story3896918/best-seed-phrase-generator-the-2-minute-rule-for-bip39