Quite a few options here. So let me start by summarising the parameters:
Under 12oz or 340g (i am assuming strung)
Easy on the arm - so under 65RA strung, and preferably lower
16/19, 16/18 or 16/20 (based on minor deviation only from your existing 16/19)
Thin beam - so 22mm and under
Good plow - so swingweight (SW) in excess of 320
Good power - note to be had of TW hittingweight stats.
There are quite a few possibilities here and i won't cover them all. Rather, it might help to pick a few out based on some categories:
- Super-arm friendly - Prince Tour 100 16/18 (ported version). Possible issue: something of an acquired taste due to muted feel but meets all requirements. Possible issue 2: very flexy, and too much for some
- Players stick - Prince Textreme Tour 95 - out of the classic mold but with a twist of the modern. Possible issue: low powered
- Modern players stick - Wilson Blade 98 16/19 - more similar to the Graphene but better feel. New CV version takes out even more vibration. Possible issue: Blades known to be a little head heavy, and Wilson QC means you need a spec check first
- Custom delight: Angell TC97 16/19 with weight and balance exactly to your chosen specs. For some the holy grail and a return to the Head PT280/630 days. Plush feel and good plow from foam fill and quality graphite. Possible issue: blind buying, but it's worked for many. Possible issue 2: head flex will be noticable compared to Graphene
- Funny head shape: Yonex Duel G 310 97. For fans of YY's isometric head shape. Plush. Possible issue: weight in the throat means swings very differently from the polarised set-up of the Graphenes
- Pro stock: Technifibre Tfight 315 Limited 16/19: the only pro stock available to the public. Based on classic head reacquets and preferences of Fernando Verdasco. Flexy and buttery smooth. Possible issue: low powered so modification required, or choosing specs from TW batch.
Hope this is at least mildly informative. I've played them all so feel free to ask other questions.