It's unclear where you're having a problem. Each proxy should be created at the original's fps. If they did not match, adjustments made to the proxy could not apply to the high resolution file as well. And, no, you are never supposed to create proxies at a frame rate other than that of the original media: "The supported workflow allows attachment of Proxies with other frame sizes & PAR (pixel aspect ratio) combinations that are divisible by the Full Res clip (for example, 1920x1080 1.0 PAR Full Res and 960x540 1.0 PAR Proxy or 1440x1080 1.33 PAR Proxy), but other parameters such as fielding, frame rate, duration, and audio channels must match." (Adobe Premiere Pro Help | Ingest and Proxy Workflow in Premiere Pro CC 2015.3 )
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