I hear you in the scary crashes.I find that if I stick to approx 70 carbs per day, I maintain my weight and my blood sugar stays in range. The reason I won't increase the carbs is that I find my swings between spikes and crashes are too scary.
When I'm on keto with no carbs I have almost flat line graphs so no probs at all. When not in keto I only eat essential fats and sparingly and end up with c.200g carbs a meal as the dosing is more accurate and the ratio improves meaning less insulin than otherwise.
To be fair I suspect with your experience - and perhaps there's not much 'new under the sun' if what you're doing suits you that may be your best option