Hmm, I mean, do you really want to adapt your tactics? They look to be doing a great job, won the league with only two losses, and a huge goal difference.
You'll be conceding the goals because your tactic is very attack minded, but its working. If you want to concede less goals, you would need to strengthen your midfield in numbers. You are basically playing a 4-2-4, so your fullbacks aren't getting any support, and depending on your opponent, Silva & Fabregas are going to get over-run in the centre.
If you want more stability to your team, you'll need to drop a striker, and play an extra man in the centre of midfield for supporting role. With that, you can drop Silva deeper and into an anchor role, which will basically offer some defensive support.
But overall, i'd say, keep it as it mate. Don't fix what isn't broken