Hey there!
I wrote something about some supplements; the stack you're taking should do the trick, especially Maca is supposed to help a lot with the load. Lecithin I suggest taking in Sunflower variety if possible. Too much can make your stuff very thick, so keep an eye on the dosage.
I was taking some Swedish Flower Pollen and drinking water in plentiful amounts, that helped me. My girl, hmhh, well, last time wasn't so great, bitter load! But I felt coming a lot, many times when I was with her. Personally I feel the excitement with a partner eases with bigger loads in a way. I'm still taking several supplements but by myself the improvement isn't that great.
Depending on your diet and overall health, some supplements can help within few days already I would say. "Overdose" of Swedish Flower Pollen can lead to a bigger ejaculation in few hours I would say, just a personal feeling.
But most supplements take few weeks or months to work the best way possible. A lot of it is about in which state your body is in prior to the supplementation.
For better tasting cum I read about Bromelain, I can suggest it, I think it helps. And of course the pineapple juice can do the trick. It's about timing though, so if you want to give sweet tasting cum you must drink the pineapple juice 2-3 hours before the action. Also avoiding garlic (and other strong spices) and red meat during the day can help.
Have fun out there!