1. Skillchain damage should not be resisted, It should be subject to a monsters overall magic mitigation, but it should not be reduced by an elemental resist.
2. Further weaponskills should not affect the windows in which a magic burst can be done. If two skillchains happen in rapid succession, both burst windows should be available.
3. The elemental damage from a skillchain should not be credited to the closing weaponskill user. Enmity free skillchains, Half Enmity Bursts. This would give incentive to skillchain/burst without causing additional damage.
4. Weaponskills effectiveness varies greatly, which reduces the incentive to skillchain. Increase damage of all weaponskills (elemental or otherwise) to relatively comparable levels, and reduce the effect of modifiers. Ideally any job should be able to use multiple weaponskills without sacrificing large amounts of damage in order to make a skillchain.