I'm researching caps for an SMPS I'm building.I did come across this which may be releavant to your problem. From AVX.
"Question: I have read that manufacturers recommend
a series resistance of 0.1 ohm per working volt. You suggest
we use 1 ohm per volt in a low impedance circuit. Why?
Answer: We are talking about two very different sets of circuit
conditions for those recommendations. The 0.1 ohm per
volt recommendation is for steady-state conditions. This level
of resistance is used as a basis for the series resistance variable
in a 1%/1000 hours 60% confidence level reference.
This is what steady-state life tests are based on. The 1 ohm
per volt is recommended for dynamic conditions which
include current in-rush applications such as inputs to power
supply circuits. In many power supply topologies where the
di / dt through the capacitor(s) is limited, (such as most
implementations of buck (current mode), forward converter,
and flyback), the requirement for series resistance is
decreased."
You say that the cap blows during a warm start? Electrolytic ESR decreases with temp. Maybe the ESR was to low to limit the inrush to the cap?
The whole AN is here.
Code:
http://www.ryston.cz/pdf/avx/tantpman.pdf
I've chosen polymer aluminums for my output caps. I've used them before a little pricey but excellent performance. Have you considered them rather then Tant's.
These
Code:
http://nichicon-us.com/english/products/pdf/e-lf.pdf