Would that...

[Leanne]

If my memory formed a keen apex,
if a single pinhole revealed -- I'm not particularly keen on starting these two lines with "if" -- one or the other would be my suggestion, probably the first, changing the second to "and a single pinhole revealed"
my life as a constant slope toward
or angle away from -- this line feels like it wants to be in parentheses or surrounded by em-dashes
that moment…
if, with a little pressure,
the rich color would seep out in bold lines, -- I can't really visualise seeping in bold lines, since seeping is much more delicate in my mind -- if it's an intentional contrast of ideas, I'm not convinced it's strong enough to work. Perhaps use a colour instead of bold?
I would write my history.

But there are no straight lines, -- a semi-colon here might be better
the points are jagged
and my history is a waxy childish smear
in calico brown. -- my primary school pinafore was made of calico, so this is a good image for me, enhancing the (innocence? ignorance? not quite childishness, I'm not sure what word I'm looking for at the minute, sorry!)

Nice to read your words again Alden.

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PS. Now give it a bloody name!