Burden resistor is primarily limited by core saturation flux (V*us integral). The values given in the pulse datasheet are related to the specified lower frequency limit and rated current, at higher operation frequencies or lower currents, increased Rt may be feasible.
Concluding:
* Pulse datasheet: Rt_max is given via Vt (and one can calculate Rt for different (fundamental) frequencies)
* Coilcraft datasheet: Rt_max is given in the table for f_min .... (and one can simply can multiply it with: f_app/f_min )
... where f_app means the fundamental frequency in your application.
Even low DC will kill performance!