House Rule on SR by spell Levels

Has anyone ever noticed that the SR chart never made
any distinction between Specialist Mages and normal
Mages, even though Specialist Mages have more spells
available to them? Or that the Wisdom related bonus
spells did not affect the SR at all for Clerics?
In my campaign, I had a character who was a Cleric
Mage, and I could not decide how to rate their SR, so
I converted the number of spells into the number of
spell levels. Then I related it to the Major and Minor
helms by spell levels, this also allowed a person who
had cast a spell or two to figure their SR according
to the current number of spells memorized. (I do not
arbitrarily rule their SR goes down if they cast a
spell, it is entirely by spell levels memorized when
they power up a helm)

Lea's SR Chart
Major Helm      Minor Helm      Spell Levels Memorized
        1               1               1 - 6
        2               1               7 - 13
        3               2               14 - 25
        4               2               26 - 31
        4               3               32 - 38
        5               3               39 - 64
        6               4               65 - 84
        7               4               85 - 93
        7               5               94 - 110
        8               5               111 - 138
        9               6               139 - 161
        10              6               162+

I also ruled that if a magical item had stored spells
such as ring of spell storing, that they could not
access those spells if they were sitting on the helm,
but they could use them if they had been sitting on
the helm and were 'blanked' from contact with the
helm.

Comments?
Lea

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