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You need to make the content as unique as possible. Look up keyword capitalisation.  You need to only use certain words on each page. 1 and 1.4 share the keyword 'metal'. You will need higher word counts to differentiate the content. Include sub titles has specific to each page

Gaston is pretty fast.

Are you making any changes to the site's backlink profile? I took a quick look and noticed that the site has some spammy looking backlinks pointing to it. That might be a reason for the decrease. Also, I think Moz has since updated their index and the metrics they use. Might be a good time to check on your metrics again!

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