Hahahaha... MY THOUGHTS EXACTLY!
The yew is an underrated method... Having said that, theres been some misinformation on the web that would leave people disappointed if they were to try it. In other words, you have to do it right, lest you'll unlikely succeed.
It's probably intuition. I've had that same experience when I bought 120 seeds thinking I had 4 times the lethal amount, but would realize that was far from enough. Bought another 240 only to realize that I've barely reached the low-end lethal dose and I needed more [24 seeds (1.44 g)/kg]. You've made a good call; it would've been a waste of seeds otherwise.
I'd say so. If you had a beta blocker, it'd help a lot.
For one, if I were to make a suggestion (besides the dosage which I've mentioned above), I'd recommend making a tincture or an alcoholic extraction. It allows for quicker absorption, which leads to a quicker death.
Depending on what method you'll use for extracting, you'll either have a pleasant tasting product that'll be free from most undesirables,
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or a bitter abomination that you may or may not be able to keep down.
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ONE MORE THING: Grab the scopolamine tablets (1 or 2 should suffice), or buy some datura inoxia seeds (10 or 20). They're what should help with vomiting. Someone's tried it with others like meto and it didn't work.