I am wondering why are everyone not using Blockchain's Chrome extension app and not enabling more layers of security when they have such options available?
Try to add 2 factor with your email so whenever you send payments you will have to verify from your email. Also increase PBKDF2 Iterations to 20000 which will stretch your password to an extreme level.
Add a second password which must not be same as your login password and must be a harder one to brute force.
But do not set that password hint since anyone will get that hint if they knows the wallet identifier.
Block all TOR IP addresses by clicking that check-box and whitelist your IP for better protection. If possible try to restrict access to your whitelisted IP addresses only but you will not be able to open your wallet at all if you have a dynamic IP so be careful to check with your ISP for possible dynamic IPs before enabling this option.
I have taken all these secure measures and now my wallet is having 4 layers of security: Primary password + Secondary password + Email authentication + Block TOR IPs. I invite all the professional hackers to hack my wallet