Am I missing something?

Daytrading ITM SPY options is very tough from a slippage stand point (besides the other obvious difficulties).

You'ld be better off getting comfortable with futures.
I agree and suggested the same however it is easier to scale your size at the start of the journey with SPY than ES.
 
For a position perspective, your guessing at a bottom, try reducing the level of which you enter so not so big a move so far but then joining the direction, betting on continuation is better than reversal and picking a bottom with a SL.

Run the maths see if it's any better, likely think just after US Open, or other times, where market likely to pick a new direction, might get you 3:1 profit ratio aswell.
 
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