Looking at the 2017 bull market start the first couple impulses only pulled back to the 1.5 extension, it wasn't until price had actually doubled that it finally pulled back to the usual 1x extension of the 3 wave during the impulse.
The lession is that when it looks like BTC is shifting gears from bear to bull market to be aggressive on the first wave of impulses and waiting for it to act like the usual impulse you get during a sideways market means you'll end up having to chase price several impulses later.
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Another way to look at this is to not assume the internal counts matter quite as much as the size of the whole save top to bottom then use .786 as your pullback rather than .618