Strength ratios for injury avoidance

[Bestafter60]

My reading tells me that disproportionate strength is the root cause of most musculo-skeletal injuries. I’ve had my share of injuries and want to avoid them in the future.
I want to know if there is a weight ratio for a given pair of exercises within which the risk of musculo-skeletal injury is unlikely. A hypothetical example: the safe ratio between bench press weight and shoulder press weight is 1.25 - 2.5x; and outside that range injury becomes increasingly likely and programmatic adjustment is indicated.

Question: What would a safe ratio be for Bench/Shoulder press? What other exercise parings would be relevant and what would their ratios be?

Background: I’m recovering from a moderate shoulder tear which occurred while bench pressing, and want to take measures to avoid such injuries in the future. I’m 61, not training for a masters’ event in any sport, aiming towards maximizing strength, mobility, and appearance.

[Mark Rippetoe]

What are your bench/press numbers now?

[Sean Herbison]

My reading tells me that disproportionate strength is the root cause of most musculo-skeletal injuries.
...
I’m 61, not training for a masters’ event in any sport, aiming towards maximizing strength, mobility, and appearance.

In my experience, it's an overall lack of strength that is the root cause of most injuries, especially as people age. Unless you're isolating some bodyparts and ignoring others, say, doing leg extensions as your only leg exercise, it's not likely to be a real issue.

[Bestafter60]

What are your bench/press numbers now?

My pre-injury 5RMs were bench 185, press 115, so 1.6 to 1. Pretty sure that would fall within a safe ratio. I'm looking for guidance on these ratios to make sure I keep in bounds and avoid setting myself up for injuries - shoulder, back, wherever. If there was a safe envelope of ratios I could tell, for example, that my Deadlift was outrunning my squat to a point where injury was becoming likely, and adjust my program accordingly. Conversely, if I started feeling low back pain, I could refer to the ratio of relevant weights I'm lifting, and adjust to avoid exacerbating matters. I think there's a useful concept here, do you?

[Mark Rippetoe]

Useful, but terribly difficult to quantify beyond what I've already done in the books.