Hi, i've used in bob-comopability mod some fix for small storage tanks. With the code it looks more nicely. Will be great to merge fix into your code lib.
Thx for your mods
Code:

local storage = data.raw['storage-tank'][fluids.tank.small.inline]
if storage then
    storage.fluid_box.secondary_draw_orders = {north = -1, east = -1, south = 1, west = -1}
end

local storage = data.raw['storage-tank'][fluids.tank.small.cross]
if storage then
    storage.fluid_box.secondary_draw_orders = {north = -1, east = -1, south = 1, west = -1}
end

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Example: https://imgur.com/a/kHYDsJI

Fix will be in the next version. Thanks!