We may have different strategies, but I'm not a huge HELOC guy for a-lot of reasons.

Let's put that aside though...great income and asset base.

Sometimes a good plan is to do nothing...if you know what I mean. I'm also in the daycare mafia right now. If you can ride out until daycare is over, and focus your attention to paying off your student loans in the meantime, you'll ultimately free up a lot of cash flow, almost 4K...good job on refi but don't wait the 15 years, go hard on that...you're paying alot more in interest when extrapolated out. Maybe + 300K after the 15 years is up...

Paying off these could free up enough cash flow where, you can just bank the difference as almost 'rental income' in a way.

I'd avoid future debt for real estate (my own personal opinion) and desperately try to bring down or pay off those SLs.