This has definitely answered everything I was thinking of. I recently bought 725M2's and 700FB's so I could start to re-bag and board everything I have in my collection. I just got tired of the regular bag and boards that you can basically get for free at your local comic shop. They just look awful after a while, and since I've invested a lot of time and $$ into this, I think the collection deserves and upgrade so to speak.
I saw a video where a guy took the 725M2's and then just placed the comic inside a TL, sans the 700FB. That actually looked pretty good to me, but I never heard what TL size he was using. I must admit seeing the back of the comic was quite nice, but I would prefer placing both the 725M2's and the 700FB's in a TL. The VERY few Silver Age comics that I own, I figure I can just go up one size from the 725M2's and 700FB's for the re-bagging of them. 95% of the comics I own are from 1970-2018, and your suggestion of using the Golden TL for the vast majority of my collection seems to be the way to go. I'm glad that I didn't buy any of the Silver Age TL's, as it seems to me that it would have been a waste of money.
I'm brand new to this CGC community, and I have to thank everyone for ALL the help that was provided so quickly and intelligently. I hope I can return the favor to anyone needing help!