I haven't sent to anyone other than PSA, but I will say get yourself a 10x magnifying glass and look at your cards in under that level of magnification under good light. Flaws that you don't see with the naked eye are much more apparent.
Hopefully that helps you not get surprised with grades, which is always a bummer. 1980's cards can be tough to find in high grades due to the production process and the ravages of 40 years out in the wild.
Good luck!
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