How to get nap #2 independent?

Has anyone else had tons of frantic crying before the second (and third) nap? We sleep trained with Ferber / extinction at 4 months. Now at 5 months, LO will still go down pretty well for bedtime and the first nap but any attempts to put her down awake for subsequent naps = 15+ minutes intense crying until a contact nap intervention.

Schedule is roughly 2.5/2.5/2.5/2.5, DWT 8 am, bedtime 9 pm, 3 hours day sleep. Been capping the first nap at 90 minutes. She’s always had long WWs for her age and any shorter seems to result in more crying. We’ve tried extending the second wake window to no avail.