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Roller guides and guides in general are often for a specific chain model. Raker can be checked and set easily by using file or ruler over three teeth and check rider in middle. New chains are pretty low when new. I rarely touch them until they are half or almost half filed. It is not needed...

Under 3mm tooth on shortest side is risky and not smart to run. Same if there is damages on drive link, tie strap, rivet, cutter. Chains are cheap compared to injury's so why risk it? Stretching chains is often from heat but can be from worn sprockets on saw and bar too.