Once a professor at my uni told us: Life is about matching! Anyway, my general rule for transistor layout, if it looks symmetrical and OK, then it is probably OK. Remember KISS principle, I have my doubts about unorthodox methods, even they show some improvements in performance, the trade-off does not really worth with respect to time and design effort. But, this depends whether you work in academia or in industry. Please, take a look at The art of analog layout by Hastings, if you havent done it yet.