Pricing high is a good practice.. Though you may scare a few folks off, the ones who come in and say "OK" walk away happy cause you brought the job in under projection.
On the other hand, when Stuff Happens (And in this case Stuff IS MOST Assuredly Going to happen, after all it's the "Stuff" tank) Well. you still bring it in for the quoted price.
My mother once had to bid a job for the company she worked for.. She did klnow how to do 'Cost Accounting" though her job title was General Accounting. (Head of accounting, over everyone in the accounting and data processing depts EXCEPT the cost accountant).
He, however was on vacation and they had to have the bid RIGHT NOW.
She gave them a bid.
They considered it and said "If you can guarantee that price in six months we will take two" (or however many) She'd bit about 3x what it would have been had the real cost accountant done the job.. NO PROBLEM was the response to the six month request. They got the job.
It might have helped that this company's tanks (The bid was for Liquid Oxygen tanks) are tested by the military by the "Drop" method.
IN this test they fill the tanks with an inert gas, take 'em up in a bomber and drop 'em on a concrete pad.. If they don't leak they try again, from a higher altitude,
When they get down to one tank.. It's an R&K (Made in Marshall Michigan) Where my Mother was the accountant back in the late 60's.