Question about "evid trim" on cards from packs I opened myself

Not too long ago I submitted about two dozen cards from a vintage cello pack I opened myself a number of years back. Most of the cards I submitted for grading came back PSA 8, with a couple of PSA 9 grades and some lower grades of PSA 6 and PSA 7 due mainly to centering. But a handful of cards were returned not holdered due to "evidence of trimming." Since I bought the pack from a highly regarded seller and opened it myself, and most of the cards came back with strong grades, I find the "evid trim" on a few of the cards sort of a head scratcher...can anyone explain what is going on with this? Are some graders just overly cautious with vintage cards that appear extremely sharp like the ones I submitted from this pack? Is it worth resubmitting the cards that were returned not holdered since many of the others from the same pack were 8s and 9s? I'm new to submitting cards for grading and would appreciate any explanations or suggestions some of the board veterans could provide. Thanks for your time!
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Collecting:
Brett Favre Master Set
Favre Ticket Stubs
Favre TD Reciever Autos
Football HOF Player/etc. Auto Set
Football HOF Rc's
D's: 50P,49S,45D+S,43D,41S,40D,39D+S,38D+S,37D+S,36S,35D+S,all 16-34's
Q's: 52S,47S,46S,40S,39S,38S,37D+S,36D+S,35D,34D,32D+S
74T: 241,435,610,654 97 Finest silver: 115,135,139,145,310
73T:31,55,61,62,63,64,65,66,67,68,80,152,165,189,213,235,237,257,341,344,377,379,390,422,433,453,480,497,545,554,563,580,606,613,630
95 Ultra GM Sets: Golden Prospects,HR Kings,On-Base Leaders,Power Plus,RBI Kings,Rising Stars
<< <i>Thanks to everyone for their responses. I guess it makes sense for PSA to be conservative on this front, even though it is frustrating from the perspective of someone who is submitting the cards and knows that they have definitely not been trimmed. >>
You know that. I know that. They don't.
D's: 50P,49S,45D+S,43D,41S,40D,39D+S,38D+S,37D+S,36S,35D+S,all 16-34's
Q's: 52S,47S,46S,40S,39S,38S,37D+S,36D+S,35D,34D,32D+S
74T: 241,435,610,654 97 Finest silver: 115,135,139,145,310
73T:31,55,61,62,63,64,65,66,67,68,80,152,165,189,213,235,237,257,341,344,377,379,390,422,433,453,480,497,545,554,563,580,606,613,630
95 Ultra GM Sets: Golden Prospects,HR Kings,On-Base Leaders,Power Plus,RBI Kings,Rising Stars
Someone recently said, and I think they had a good point, that PSA doesn't issue vouchers on the "evid of trim," but they do on the "min size." so this may be a reason they slap the "evid of trim" on so freely these days.
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I have a Mays coming back from a recent submission that was cracked from a BVG 9 holder. I know that Beckett grades sheet cut, but how can you tell with the decals?
Beats me. I'll have to compare it with the Aaron I have in a PSA slab.
I'll be posing this question when I get the order back. All six were cross overs and submitted raw. The results are interesting.