I like tis type of VSF, but I dont know what genre it is, because its not really VSF:
Uniforms and factions of 1871-1880
Giant Steam Landships and Aether travel to Mars and Venus, BUT
with Edwardian diesel contraptions, like WW1 tanks (with slow reloading guns, so cavalry can charge them with sticky bombs), Early 20 century cars and airplanes up to 1916
Its not pure VSF, but also not a Dieselpunk, and not Pulp. Its like diesel engine in VSF era, but steam are stull used for big ships (maybe diesel fuel are moe expensive in this world to build HUGE ships with diesel engines)