Yeah, those skimmers are hard to see. Thankfully dumbfires have a very large splash radius. ;3
As for your attempt to kill the skimmers actually using the SRV like FDev wants, good luck! Those base defenses get pretty scary. It's fun ducking and weaving while trying to find safe blind spots to recharge your shield in. Just watch out if they call in air support of their own! Nothing quite as terrifying as having rail and PA shots slamming into the ground all around you!
I just took a skimmer mission (8 kills in O'brien's progress+++, Umbila). Worked like a charm. The FAS on the landing pad got me worried, but it didn't take off. I hope it's intended, because before, ships would snipe you way too easily.
Like you, I landed right in the middle of the base, deployed the SRV and sent my ship away. It took way longer than your method, partly because I'm not that good, and because you actually have to drive around the base, but it's really not that bad. Sure it was "only" a +++ base, but it's actually way more enjoyable than looking for blue circles 5km above ground and driving around "aimlessly". If a defense turret shoots you, shoot back. They are far more dangerous than skimmers.
I got some bounties on my head, but no notoriety, so you can erase that at an IF before going back to complete the mission.
So all in all, it's more difficult than before, but it's still very doable. With a bit of practice with the turret, it will feel like a tank simulation for sure.