Don’t be emotional and review deals just like you always would. maybe it’s easier for me because values could plummet 30% and I’d still be making same decent CoC I get out of my deals.

Values will plummet. 

@Timothy E SullivanSelling all your stocks when the market just plummeted?

Also, if you buy a rental there is always the chance that you get a bad tenant that doesn't pay, there is the occasional vacancy which plummets your income down to zero while you are still paying rent on the place you live in, or a tenant that doesn't properly care for the property which causes additional repair costs. 

Our income will skyrocket just when our child graduates high school (then plummet when we send her to college!)

Then your turnover and vacancy rates will plummet, and your tenants will start giving you referrals to other great tenants for your other units.

I've used credit cards to purchase properties or use as a part of the down payment before, just be aware of how the cards affect your credit and financials because, using the cards can push your metrics to the point where your exit strategies may no longer be available.One example would be, maxing out your credit cards and your scores on your cards now plummet 100-150 points (like you had mentioned), not only this you max out cards that had a min payment of 5% of the balance so your 100,000 balance shows up on your credit report as $5,000 per month.

When things started plummeting I did my best to buy more. 21 years later, I am getting there.

Even if prices plummeted, and rents went down by 50% (which you state never happens), I will still be cash flow positive and able to ride out a downturn. 

It's finally what it should have be return-wise had the market not plummeted!