Question on the RGK variant of PoJ

I was wondering what people are running to try and manage best when to start the burn phase of shennlongs? The most difficult thing for me is lining up cold w/ shennlongs and I try and get ready in the physical phase but many times I can’t quite get it to trigger or it triggers too early. Any tips people can give me to better lines these 2 up? I have tried the passive that gives 4 spirit and halves the activation cost of mantras but I find I can’t get it to trigger fast enough most the time then even when my spirit looks almost 95-100% full.

I would check the resource cost reduction % on wudijo’s char.