Error importing the string, edit your post with the code format for the string instead of a quote and I'll take a look.
Also it's likely you're coming up with the issue because you don't actually gain a buff from SLT and you'll have to make the WA look for the gain of SLT in the combatlog.
Edit:
Something like this:
Code:
d4IBbaGlIyBIYmvjnBvCtvIVruTtr1Er7MQ2pf8tk0WKW4OKbtrnCiDmioNukluv0IPilhWdLs6PkltkEoutvQMmLA6cxvkvxM01fzJQcBgOTlr)gutts3gKxRs5zQshMkgVkvxskXTikNMW5vv9zQ0Jjs)vvzIWoheNnNn7C2cm6X5FHJ0ByUwq5(nccI1GpK)AzjVPP((M10uGKrqz1moa1va77)OkNqkSN7a7yZoha8rzNdkDcb7myWGtyZHpbxaiCDva25IFuLtlvFWHtM0s1hlbckUZ9T2VCXyoNwQ(GRvyitoHbZxHD5sy9dJQNtUdKYNCjS(HHtas1Kxe0exYRLQp4cbKAZLW6xYlc(KdJQNtUdKYnubGimy(QWFZG5oCOqm4UBeeeRbFilRXQOw02BTIGuZSSiOSALZNG6acxxfaZCegCyoejvjYLyXvYCKArbds
I haven't really tested that aura to make sure it works but it should work with that WA I posted.