ArA shouldn't give you any issues despite your past injury history. It does increase inflammation so if you already experience joint pains in those areas, it might be a little more noticeable. Personally, I never had joint issues with ArA. ArA and ABE is a great stack. Another good supplement to stack with it is Alphamax.
Alphamax contains a full 50mg of 95% Forskolin, a dose shown in clinical studies proven in humans to increase Lean Body Mass while decreasing Fat Mass. It contains a full 1.4 grams of Divanill, leading to lowered SHBG and increased Free Testosterone.
Contains 300mg 98% L-DOPA which will increase Total testosterone having synergistic effects with Divanill. And to round it out it contains a full 75mg Arimistane, this will keep estrogen under control while also controlling cortisol, leading to an increase anabolic environment.
The L-Dopa and ZMA will also lead to better sleep which can lead to better recovery. The Forskolin is worth the price of Alphamax alone if you look at just that one ingredient. The great thing about Alphamax is that it is an open label, no prop blends. You know what you're getting and at what dose.
How long have you been back from your shoulder injury? I would suggest lifting without any supps, besides creatine, protein, and fish oil for a while and let muscle memory kick in.