Aggressive tactics are called for when trout fishing crankbaits for lunker trout in fall and winter in streams and rivers. Shallow running minnow pattern trout crankbaits three to 4.5 inches long are the best baits. Focus your casts 45 degrees to 55 degrees up current and sweep the bait across likely spots that look like they would hold fish. The trout fishing tip here is to that predator trout are also territorial and exhibit aggressive behavior to perceived threats. More often than not the strikes elicited when trout fishing this way are aggressive territorial strikes vs. a feeding strike.
When you get a nudge or bump by a trout to your crankbait, mentally mark the spot where it occurred and repeat and focus your casts to sweep the same spot. Often times the fish will get more irate and irritated and will become more aggressive with its subsequent strikes to your bait.
Another tactic to consider if you get a stale response to subsequent throws, is to change over to an even larger trout crankbait. The larger trout crankbait may elicit a more vicious response due to the fact this larger bait is perceived as even a larger nuisance or larger perceived threat than the smaller crankbaits do.