I am hopeful to get a bit of an education in this thread. Personally, I use ELU, HND andSPD to determine WR for all positions. I have noticed no difference between Deep and Possession WR (using Guess ratings) for production for my "Medium" passing game. In particular, I do not see benefits in GI/Tech/STR in any meaningful way.
I know there are a ton of factors in completion % and YAC that make the stats hard to parse (at least for me) which probably influence my decision to simplify the WR evaluation.
I review STA/WE/ATH as well, but I do that for all potential recruits.
In summary, I reduce GI to 10, Tech to 5 and remove STR entirely. I spread the remaining numbers to SPD, ELU and HNDS to make them have equal weight. I am sure more experienced coaches will give better opinions.