Bostons will be getting Boost technology in September so will be a very different shoe. Adios is being discontinued from July, but the Adios Boost will continue. I'm racing and doing speedwork in Adios Boost, fantastic shoe, decent amount of cushioning for such a lightweight shoe
I've had numerous shoes that fit well and feel comfy, yet have given me problems. I've done numerous assessments to ensure my running form is as good as it can be, yet I've still had problems. I've had less problems when getting shoes after gait analysis.
Gait analysis is not totally accurate but I do feel it can be a useful guide, so get frustrated when people make such sweeping generalisations that it's a con.
Could try the Gloucestershire X-Country league (www.glosaaa.org.uk), quite a few Warwickshire clubs take part. First fixture was on Saturday but there are 3 more at Cheltenham, Malvern and Gloucester. Unattached or non-member club runners can run, only a couple of quid per race.