A lot of bands get softer as their careers progress. Whether that’s due to the righteous anger of youth fading, record companies and producers “sanding off the rough edges” for commercial radio, or just the members getting old, it’s an annoyingly common career trajectory. The Replacements, Cheap Trick, pretty much every punk band that went “New Wave”…heck, even the mighty Led Zeppelin’s last album is pretty flaccid, if you’re willing to admit it. So it’s a pleasure to report that the San Francisco band The Spiral Electric have bucked this trend, and grown steadily heavier, in live and on record, since their earliest incarnation. While they were never exactly “soft” in their…