[O.B.Left]

as always have to work on extensor especially in the downstroke and release, where my left arm tends to bend a little bit losing what would otherwise be a deeper release because of a straighter left arm

Doesn't look so bad.

Slightly bent is ok , hyperextended ram rod straight or beyond straight when I goofed with it hurt my left elbow. Slightly bent can absorb more shock at impact. Something I had to do until my elbow healed. Could the bend be compensational for an old injury? Probably not, but its something that happened to me.