Hi @jamieclaussells,
As you probably know, Minification alone will not help improve your score or website performance.
If you are able to back up your website, I would experiment with the following;
1. Minify HTML, JS, and CSS with Autoptimize. Use the other plugin features as well.
2. Use Cloudflare for what it is … a CDN. Mainly, enable only: HTTPS, Brotli, WAF, Page Rules, and APO (only $5/month, but well worth it). The rest will not help much. We’ve rigorously tested all of their features. Feel free to experiment with them. Each website responds differently.
Also, I would not rely on PageSpeedTest alone to identify your website’s issues. I would use webpagetest.org (online tester) and Lighthouse (browser extension).
And finally, do not use more than one cache plugin or plugins with duplicate features.
In our case, we use SG Optimizer, Perfmatters, and Cloudflare Pro. These plugins do not overlap. Each plugin offers a unique feature. Our website loads in less than 2 seconds (more important than scores). Our scores are Desktop (100) and Mobile (97).
Hope this helps a bit.
Best wishes!