You are playing with fire and you are going to eventually get burned, it is as simple as that, probably the reason why this still has not happened to you is because the leverage that you are using is small.
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I'm not sure it would be much of a problem for OP. Like you said, his margin level is quite small and doesn't pose much risk since Bitcoin's price doesn't typically drops several percentages at a goal. Also, from OP's post it's obvious that he usually buys at support levels. Stop loss works but it might not be the same for everyone.  It depends on the individual's strategy and their trading plans. Most people makes trades that gets them faster to their take-profit targets  than to a stop loss. My personal trading experience involves using stop losses because there's only so much loss that I can take. At the end of the day, It all boils down to one's trading plan and strategy.