I am using SparLE 1.7, fire face 800 on Mac Pro and protools 10 or 11.
On PT11, I had problems with 88.2. It seems to accept only 88.0 : it does't work, so.
It works at 96K quite well (sometime it crashes on disk access with protools when it loads instrument but I don't know if it comes from overload with PT or from Spark)
Now, if you start at 44.1 with the spark standalone software, and if you change to 96K, the internal software of spark does't make well the translation of the samples and the sound is like listening a 44K sample at 96K.
You have to restart SparkLE with the config saved with the same sample rate definition between Fireface and Spark.
I hope it will help.