Should I be waiting for firestarter procs after I cast Fire I?

[Zamoth]

Obviously Fire I followed by Fire III via firestarter is more dps than hard casting two Fire I. My question though is that since Fire I has a travel time, and I can almost always start casting another Fire I before the previous fire lands, should I be doing that and then using firestarter procs or should I literally be waiting after every Fire I cast to see if firestarter procs and using it appropriately?

[Orophin]

Things I have read says it is better to precast your next Fire and pick up your Firestarter proc after that cast. I don't know if that's 100% accurate though.

[ThunderPants]

To save on MP, I'll start casting Fire1 and then move a step to interrupt the Fire1 cast to use the Fire3 if Firestarter hits. The Fire3 goes off instantly and you can immediately go into Fire1 again.

[Professor_Awesome]

No, the amount of time you waste waiting every single Fire I cast is not worth it. Furthermore, you waste even more dps if you interrupt a half-finished Fire I to cast the proc. Finish your current spell, then use the proc.