Regarding the calculation method of Molten Strike DPS Calculator?

Molten Strike DPS Calculator:

https://moldydwarf.gitlab.io/MoltenStrikeDPS/moltenstrike-simple.html#zip_eJyrVirIT3JKzMlxyU1XsjI0AAEdmJhHZolzRmJecipYBizsm5qTmoquFizoWFAMEkQIYNEdkOSSWVyiZJVXmpMDFfDPU7IqKSpNBXPdEouCM/JLQGJpiTnFEEG/0lyQY4Cmm8FdFpSYklkKFLGEWJdYAfYC0GyIfUamOkpJ+cXFMGVGtQC2iUvI

-

https://preview.redd.it/nt87cp215iwd1.png?width=569&format=png&auto=webp&s=33084770a534149bcc65cfc945a3e3b5cfe3c4d2

https://preview.redd.it/8dilitx15iwd1.png?width=715&format=png&auto=webp&s=6fd5107c9ae65b6504975f2840fff9d43d6045eb

As shown in the picture above

I don’t know how much distance is 1.7M? What number should I convert it to?

The web page displays "Error: pobMaxBallDistance: 1.7 < 2"

I'm debating whether to buy Focused Amulet with -70% increased Projectile Speed

But it's very expensive. I have to think about it carefully.

I'm from Taiwan and my English is very poor. Sorry.

Thank you in advance for your help!