Anomalies do exist!
For weightloss concerns, simply putting in time at the gym (and actually lifting, not texting or talking about lifting. For fucks' sake I hate that shit) is going to be a pretty sufficient calorie burner long term. Though I'd stress proper form over even starting to worry about max numbers etc. Especially if you are lifting/at the gym to lose weight. Just concentrate on pushing each time you go, and leave sweaty and drained. Everything else is beyond the scope of simple weightloss.
On squats specifically, my anecdotal experience is that the people who struggle the most with them tend to have a) bad form and b) a very weak core. Or they've developed a dowager's hump while being a tubbo, and they can't physically get their arms behind their head. In which case: Goblet squats! not nearly as effective, but when your option is "or don't," do the goblets. But yeah, I squat 325ish (was my max a month or so ago for 3 reps, not really confident enough with the home weight set to really go too much higher without a spotter) and my bench is 265 (also a month old, but same confidence)atm. I'm also built like a Lord of the Rings dwarf. The range of motion a 6'3" guy has to do makes my little 5'6" shit look like I'm cheating. So there's definitely that being an issue for taller folks. Even so, if numbers are your thing, I would do some serious core workouts to get that up to snuff if it isn't. Planks, medicine ball tossing, etc. It can definitely help a lot if you haven't spent time developing it when it comes to.. well, basically almost all lifts. And yeah, if you aren't sure on your form, get some advice on it. At 225 (no idea your overall body makeup) you're lifting heavy enough to fuck up your back a bit if you are doing it wrong. If you are doing it right, I would recommend the core workouts to shore up that weakness (if it exists!) and then see how quickly you progress. As for Warmuth... stop being tall? =/ JK~ Yeah definitely look into someone of similar build and knows their shit so they can critique your form. I would wager that is a huge part of any difficulties progressing.
Calves: You -can- strain them to get them to grow, but compared to people who are just predisposed genetically in that fashion, it is a retardedly long uphill battle. Only real advice I would give is to use heavy ass weights and do various calf exercises. Don't grab a couple of 30s and start doing calf raises; that's not going to do much for size. Get into one of those sitting sled deals with the knee pads:
and proceed to abuse them. But even then, you are looking at like... -maybe- 1/4 of an inch growth every other week or so. Maybe. Again, it really depends on your specific genetics.