Trimming the strain screw cause the screw to put less bend in the mainspring, thereby lessening the force the mainspring puts on the hammer. If you never have a misfire with the ammo you use and will use, it's not a problem.
If the gun cycles very easily, that's mostly a good thing. However, it probably means that the rebound slide spring has been exchanged for a weaker one. Whether this is good or bad depends partly on how you handle a gun. Given whatever your habits, instincts or reactions are, you must be sure that the trigger returns reliably, so that you can fire DA quickly with no hangups (trigger return problems). Myself, I strongly prefer a full-strength factory rebound slide spring. However, I recognize that this is a personal problem, and may not be true for everyone. I'm going to go out on a limb, and speculate that the end results may even be affected by grip choice (!), as it can affect how the finger reaches the trigger. Regardless, I feel safe only with factory springs, but I know that there are others who are fully justified in trusting some pretty fancy modifications.
The situation calls for individual testing.
BTW, nice-looking gun! All it needs is a Tyler.
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