hmmmm interesting time to race, its not a bad call, but just remember the main rule of thumb, you need a better hand to call a shove then you do to make a shove, so yes you was ahead of his range, but not by much, it was a big risk to take when you had a stack size that you could use, as it was you chose to race and lost this time, and you lost 1/3rd of your stack,
i personally depending on the blind level at the time could of possibly let go of 5 5 and waited for a better spot which would protect your equity in your tournament and reduced the need to steal with 6BB.
The main issue once you get to 6BB is its usually not a hard hit, and people are going to call light usually because they will nearly always have the correct odds
to make the call regardless of what they hold
once your down to 6BB yes you no longer have reason to wait for a better spot, because waiting for a better hand if it takes 2 orbits you have lost half your chips and are doubling up to get back to where you are now, so might aswell take a risk and try and double up now, which in turn if you win the hand people will note that you have shoved wide, and so will call your shoves lighter as long as they dont pick up that you have changed gear already