(only considering size Large) Other diapers with an 8" wide crotch include safari, space/simple, fabine, magnifico, carousel, and (original, not current) crinklz.
The DC Amore Idyl is slightly wider than 8", though I may need to re-check that.
I haven't seen anything else with a wider padding in the middle. Actual total width (including the leg gather border) can vary quite a bit, as can leak guard height, which may work into your needs. for that, crinklz/betterdry's current diaper has insanely tall leak guards at 2.75" that more than make up for a slightly narrower padding. Most Tena products OTOH have laughably short leak guards and small borders.