Although this can never be proved I don't think the -10 has actually had any net effect, positive or negative, at all.
I think a number of teams early on in the season wrote us off because of the deduction and failed to take us seriously enough. Far more than that, i think the team played with a freedom that enabled them to play beyond their ability, like a team who have been relegated see an upturn in results once that pressure is off. Once we got ourselves back into the reckoning we did the usual Cov thing of imploding. So what we lost in points we gained in that freedom and being underestimated.
Start of the season we were attacking to an almost ridiculous extent and leaving ourselves wide open at the back. Second half of the season we've tried to be more professional and defend better, but results have fallen off a cliff.
But of course the biggest problems have been 1. The loss of Clarke 2. Moussa's injury 3. Wilson's injury
Without most of those players next year, even lower budget and the loss of that 'freedom' next season will be a very difficult one indeed, especially if SP's scouting and recruitment doesn't improve massively.