Yes you have they just don't post about it. The amount of guys who use syntherol on this site and don't post about is massive. As I posted start at 1ml in both bi-cep heads. The tri-cep is roughly 2/3 the overall size of your arm so is key if you want to gain an overall bigger/fuller look. So I would pick 2 out of the 3 tri-cep heads (rotate) and inject daily starting at 1ml. Then move up to 1.5ml for all injection sites. Everyone is different and some need less and others need more. Big A protocol is a guarantee though and will put size on them very fast. You could do that or what I post and go on feel. Anyway after trying 1.5ml you may want to go up to 2ml. Do that and then gauge results and go from there. I know for me I could carry on that protocol eod (after doing ed for a few weeks) then over more time e3d's. Others may want a less frequent maintenance protocol of once weekly injs and that can be used after the initial "cycle" as well.
Combine all this with obviously new/great training and really going for it (I recommend low volume but frequent arm training) and you can easily have what you seek. Then just drop all arm shots 14-7 days from your show and you will be gtg.
I never get the training posts to questions like this. Didn't you get to something like 280 and relatively lean. It's not like another 20 pounds will make just your arms and nothing else grow
Training is everything and should always come first but guys need to use common sense. SEO is perfect in circumstances like this. Were you basically want a lot of increased size on an already developed bodypart that you already train very hard but it may be lacking compared to others or you simply want it to stand out more.
My arm training is very advanced and I use a variety of techniques but it's laughable some of the guys on social media going on about improving their arms and they load them with seo but pretend it's just through training. So they stay the same bodyweight or even lose weight through dieting yet sticking their little finger out on curls and doing some partials reps made them grow 2 inches without anything else changing. You know bodybuilders lie all the time anyway but when it comes to seo it's ridiculous. I can understand why they don't want it to be known if they compete but still there is no honesty.
Obviously injecting a 5% bodyfat physique with anything could lead to losing detail so that's why it's important to stop before the show. It's also why longer pins deep in the muscle under veins are best as they will push up the muscle in the sense. Through time you will also get better at injecting and you learn lot's through trial and error. Whenever I start syntherol in my arms they get more vascular as everything is pushed to the surface so my veins stand out more. The issue I personally have is brusing at times so another reason if I ever competed (I never would) for me to stop 2 weeks prior to the show. Different products and most importantly aas site injections also can cause 10x more inflammation so are best avoided. That's why I always say to guys don't mix your syntherol with your aas shots. Honestly arm shots are so easy for me but you may be different. I just have issues with consistently due to laziness but the injections themselves are even enjoyable for me. My calves weren't even that bad but 10x worse than arms. You also want to use the smallest G possible for arms shots so 26-27G is what I recommend for syntherol.