How do I correctly use Automation with Original Estimate?

[Aron Kuch]

I want to use automation to change the Issue Type based on the Original Estimate field. There are four options/levels.
For the If and Else-if blocks, I tried using Issue fields conditions, but Original Estimate did not appear in the list Field. I tried the Advanced compare condition (the "If: matches" in the graphic), but it did not trigger and I tested 350h, 350 and 350*3600. Last I tried JQL condition (the "Else-if" in the graphic) which worked but could take up to 2 seconds according to the audit log. The audit log also included the line "We recommend using the 'Issue fields condition' for more consistent results."
Am I doing this right? Is there a better, more efficient way?