At this point, I'm pretty sure if there were some legitimate offensive upgrades on our bench Doc would have tried them by now.
It's really an offensively inept team, on the whole. The team is, and has been for a long time, built to rely on the Big 3 to score 50-60 points a night at least. Now that it's completely unrealistic to expect that from them on anything approaching a regular basis, we have a team that struggles to score 90 points and has to scrape and battle on every defensive possession to keep the opponent from scoring 90.
That's an enormous burden, especially when your team gives the opponent tons of extra possessions due to turnovers and offensive rebounds.