Astaxanthin is gold. How is this working out for you so far?
You mentioned compound lifts three times a week - assuming things like bench press, squats, deadlifts, pull ups, military press, cleans and the like? Sounds good, make sure to don't skip deads and squats, biggest releases of GH and test from those. I think general consensus is heavy weights with low reps increases test, while mid-lower weights and high reps increases more GH. Might train heavy for a month or two, and then switch to higher reps. Make sure you don't over train either, take a week each month or two to train really light.
Of course, get good amounts of protein and healthy fats, things like grass fed animal cuts and pastured eggs. Need fats for creating testosterone.
You could look into carb cycling, I've found it pretty useful. Basically consume majority of carbs right after heavy workouts, and keep carbs low the rest of the time. Improves insulin sensitivity and the carbs that are consumed after a heavy workout are preferentially used to replenish glycogen stores and build muscle instead of being stored as fat.
Definitely second the recommendation for HIIT. Amazing stuff, hits all the right hormonal buttons. Very practical too, you definitely don't need or
should do an hours worth of HIIT, I think Deep Thought was just making a comparison on this. Fifteen minutes is all you need to begin, and to see effects. Honestly wouldn't need more than a half hour tops, I usually keep it around 15-25. Burns fat, preserves muscle.
I personally love Ashwagandha - I think it is a bit gaba-ergic but considering the Yogis and people of India have used it regularly as a tonic for thousands of years, I think it'd be safe to consume regularly. Schizandra and Jiaogulan are great choices as well
I've found Deer Antler to be a definite boost to my training, along with Cordyceps. I'm not talking the crappy IGF-1 bodybuilding deer antler products, and I don't think they even have an actual direct anabolic effect. But a quality Deer Antler extract, say from Dragon Herbs, Jing herbs or any other high-end herbal company is a definite boost to training. Improved drive, improved mood, more aggression in the gym (and life in general, the good go-after-what-you-want aggression, not physical aggression). Again, a good quality cordyceps extract, preferably hydro-ethanolic, will do wonders for your energy levels and performance. Both of these supplements have a myriad of other benefits as well.
I see you're from Switzerland - I'm not sure what importation of supplements is like there, but I've used Driven Sports' products for body recomp with good success. Activate Xtreme for test boosting, Triazole for estrogen reduction, Lean Xtreme for a non-stim, anti-cortisol fat reduction. Not steroids, just hormone boosting. Good products, not necessary, thought I'd throw them out there.
Keep us posted!