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Buffing will leave the pattern blurry, That's why I said lightly buffed. Buff just enough to put a little shine on the 15N20 and that will improve the contrast which is what you were asking about. The 600 grit should be enough, I rarely go beyond 400 grit myself.
A proper HT will be important to a good etch. Fresh etchant is important. A clean finish is important - the last belt you use needs to be sharp. After those bases are covered the steel itself is what's left. If you don't get the results you like try adjusting the mix of steel in your billet (next time) or try some 1080 instead of 1084...
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