The original question: why are you losing the leader? It's because your connection knot between mainline and leader is the weakest link in the system. Rod power, drag resistance, connection knot, mainline, leader, terminal knot all play a part. If one of those is weaker than the rest, it will fail first. It's as simple as that. What do you want/expect to fail first? Without knowing the details of all those parameters, I'd assume you need to practice tying that Alberto knot, and do some break tests on it. Another solution could be use a lighter leader. Personally, break offs not due to teeth or abrasion are unacceptable, so I think you need to look really hard at the entire system from reel to hook.