Do we though?
We've scored the most goals in the division (31 in 16) which is a scoring rate that puts us on pace for 89 - which would comfortably eclipse any of Karl Robinson's teams, and indeed would be more than Appleton's League Two promotion side managed - despite both of those clubs having an elite goalscorer, which we currently lack.
I keep harping on about last year's Plymouth team, but I really do think they're a side that we can realistically emulate. And their top scorer in the league (Ryan Hardie) scored 13 goals. And they got 101 points.
We need another striker as competition/depth for Harris - but in my opinion it is more important to bring someone in who can contribute effectively to our all-around play even if they're not an elite finisher than a pure out-and-out goalscorer that won't (both would be great - but probably not realistic on a League One budget, unless we happen to strike gold on some loanee/lower division kid)
Also, yes - if Harris had his shooting boots on then we would have scored at least five on Saturday (he missed three gilt-edged chances.....missed two of them twice......but one of those RR thumped in the rebound). But we shouldn't need five goals to win. If we had conceded an equalizer, I would have been more angry with our frankly dozy defending, and failure to deal with relatively simple deep floating crosses, for the first two goals.