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Piece density was a topic 8 years ago Aronson started,
http://www.chessvariants.org/index/displaycomment.php?commentid=23951.
F.i.d.e. is 50% there. Piece-type density often stays very close to 10%, much as
that F.i.d.e. is 6/64 there being RNBKQP; but the type-density topic is
scattered around.  At one extreme Battle Chieftain works with 1/84
piece-type density. Of the 24 leading NextChesses, only Schoolbook and Centennial are exactly 10%. However, Black Ghost would be within a hair's breadth.  (Note piece density of Centennial is 52%, so only Schoolbook has 50%-10%, but so do most of the other Carreras of 80 squares, of which Schoolbook is representative.) The twenty-four there are: Bifurcators 7/80 and 7/64; Great Shatranj 7/80; Mastodon 7/80; Three-Player 6/96; Unicorn Great 9/100; Big Board 6/100;
Sissa 7/81; Eurasian 8/100; Schoolbook 8/80; Fischer Random 6/64; Bilateral 10/84; Centennial 10/100; Kings Court 8/96; Wildebeest 8/110; Transactional(#15) 6/64; Fantasy Grand, as low as 7/100 and as high as 20/100, where it requires at least one druid army to go over 9%; Black Ghost 6.5/64; Eight-Stone 7/72 with stones as one piece-type; Modern 7/81; Melee 9/81; Templar 7/72; Courier de la Dama 9/96; Switching 6/64; Seirawan 8/64 counting each deposited piece full unit, the 6+1+1, as virtually certain entry.