KSI, I don't have any Silver Split Spades decks left... but from what I recall, the Silver Split Spades paper did feel very slightly sturdier than the Black Lions.
I wouldn't say it's David Blaine's fault... it's more USPCC's fault for not even attempting to improve their poor quality paper at a time where EPCC and LPCC paper stocks are tons better.
You're right about the Classic Twins (and also the Classic black and Classic gold) featuring the Classic Finish, as does the Draconian deck. The Elite Finish that the LUXX Palme uses I very good also. Whilst I'm not 100% sure about this, to me they feel like the same paper stock, but with a different embossing pattern (and possibly a slight variation in coating).
The Elite Finish pattern does appear to give the cards more durability than the Classic Finish. For what it's worth, I like the Elite Finish very much.
If only Blaine printed his cards with EPCC of LPCC... they'd be so much better than the badly cut, and cheap feeling, non-traditionally cut cards that they presently are.
HolyJJ, I actually mean the 1st Edition Split Spades Lions which was printed in OHIO. I love this deck very much. The thickness and handling is just like an UV500 or OHIO Casino Bee.
For the stock using by USPCC, I think I have similar view with you. Since 2014 there seems very few Bee Casino stock being used. I got some 1902 Erdnase Smith back (red and black), which said to be using the Bee 825 casino grade paper. These decks are quite close to those OHIO Bee Casino stock in terms of thickness and stiffness. But since then, I never have chance to get a deck with such thickness and stiffness.
And for the traditional cut. I got a brick of HoneyBee, which said to be under traditional cut. But the deck I opened, was not. Yes I think this is an accident, an accident caused by USPCC. And this accident appeared on your Black Lions again.
Recently I opened 2 decks of normal Tally-Ho, and a Bicycle Cupid back, and a Bicycle Speakeasy Deck, and a Bicycle Skull Deck, and a Bicycle Guardians v1 -- they are all traditionally cut. My feeling is, it seems that for their in-house decks, there are a significant portion being cut traditionally. But for those custom prints, the percentage is relatively small. And even you requested to do so, sometimes accident appeared.