Adding more spells in Spell, Spelllist, Spelleyecandy.mes

Hello,
Once again, I have a matter with spells and with limited place in Arcanum.
How could I add more spells than the existing one ?

I write correctly spells in Spelllist.mes and Spelleyecandy.mes (rules) (I tried with existing ones too) and I write them in Spell.mes (mes) but they didn't appear on WorldEd on the spells slots.
In Spell.mes, I add them since 223. (222=permanent wolf form)
In SpellList.mes since 14150
In SpellEyeCandy since 223.

The files are read because the game read the spells which are instead of Wolf form and Quench life full (the 2 last spells).
Did I forgot a file or is there a limited number of spell equal to 223 (cant' we increase it by 20 or 30 ?) ?

By the way, why isn't there a line 781 in spell.mes ?