Reducing mine damage marginally won't stop squad wipes. It just means it will be even LESS consistent because units aren't always going to be at full health, just like how their formation isn't always going to be the same either. You'll still have wipes, but mixed in with lots of non wipes. Or situations where half the models die and the other half are left with 10% hp and suppressed. Ironically you're introducing even more possible outcomes.
If unit isn't at full health, then THATS your problem.
You are taking the risk while pushing with units which are not healthy. On the other hand, if you have a 4man grenadier/PG at full health, you won't be punished by a random wiped after turning a corner. I fail to see how you are increasing the outcomes, when you are just reducing max damage value compensating with applying suppression.
People most of the time confuse full health n model squad wipes and full model squad wipes.
If the model health is at 90%, nothing changes compared to what happens now. But in the case of 100% health, then that model survives.