The first steering box reseal was faulty, from what you describe there was a mechanical bind and the second "rebuild" didn't solve the problem.
I'm also suspecting that the idler arm bushing is bound tight at this point.
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4. As he loosened the bolts on the strut mountings a bit, I thought the steering heavy symptom may cause by too tight on the nuts of each part. So can I just loosen other nuts on the other parts of the steering system i.e. on the idle arm bushing etc. or even more on the strut mountings.
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No no all counts. All of the bolts should be properly tightened. The strut rod ( shock ) rotates in the strut so having a loose nut will only cause the holes to wear out.
You need to find mechanic 3 that understands the engineering behind a car.