Is there an easy way to get some waterproofing?
Happy to help - I'm a PM in technical apparel. All rain gear has a waterproof membrane that can degrade over time, since dirt & oils breakdown the membrane. It also gets coated with topical DWR. The membrane can't be replaced, but many people see an improvement when they wash their items. Washing a few times a year really prolongs the life of the garments. There are expensive tech washes on the market, but any mild detergent will work. Drying helps as well, since heat strengthens the bonds between DWR and the fibers. (But check your care labels, a few manufacturers like Flylow advise against drying, and it could impact your warranty. DWR only lasts for a limited number of wears and washes, and can be reapplied with a topical or wash in. It won't replace a shot membrane, but it adds some extra oomph on the really soggy days and can squeeze a little more life out of the garment when the membrane's starting to fail.
If it's new, I'd look at the type of membrane that you're using. Goretex (or a manufacturer's proprietary membranes like Patagonia H2NO, Columbia Omnishield, etc) all come in a few constructions: 2 layer, 2.5, and 3 layer. All 3 constructions use an exterior fabric, the waterproof membrane and an inner protective layer that protects the membrane from dirt and oils. 2 layer uses a separate nylon inner lining, that tends to be the best bang for the buck for waterproofing. 2.5 uses a spray or film layer, which is less durable and the cheapest option on the market. 3 layer integrates the protective layer into the rest of the fabrication so it feels like one piece of fabric. It's the most durable and waterproof, but tends to be less breatheable. Some improvements have been made to this technology to really do it all - like Goretex Pro, Goretex C-Knit, or eVent. From there, differentiation between brands is just things like fit & pockets. Goretex and most of the proprietary membranes are all made of polyurethane, so if you're wetting out in a 2 layer Columbia jacket, I wouldn't expect 2L Gore to be much of an improvement. eVent is the only technology that uses a different material than polyurethane, but the only major differences are that it tends to be more breatheable/lets in more wind and needs to be washed more often (once a month or so for weekly wearing).
And as mentioned, no fabric is ever 100% waterproof - with enough pressure, water can cut through sheet metal, and the same concept applies to outerwear. In the PNW, it's not uncommon to see people in trash bag jacket covers or racer ponchos on the soggiest days. Cuts down on breatheability, but worth it when the days are super wet.