That's not something you have to worry about, as simply having a poor game is not a reportable offense. How many people report you for not doing well is irrelevant as a false report is still a false report (0+0+0+0+0 is still 0). Your best bet is to not worry about how to "shorten" your reform time or avoid getting reported, and instead focus on getting rid of negative habits and building positive habits in place of it.
I say this because your mentality going into the game and going into reform plays an immense part in how you will develop from this point on. If you go into it, thinking "how can I avoid negativity" and "how can I not get punished", then you're not really making progress. You're just doing damage control. When you start focusing on building positive habits and letting go of older habits you can recognize as a negative impact to the community, then it becomes easier to move forward and worry less because this is active progress. Another way to look at it is instead of assuming a bunch of -'s and trying to tip toe around that, just do your best to builds +'s that will make you a better person.
As for actual habits, get into the practice of becoming more conscious of what you're saying in these games and how that can affect your teammates. Before you say things, think about whether or not it's necessary or if it's just a detriment. When your jungler makes a mistake and dies to your lane and you want to say "wtf noob jungler" or "stop feeding my lane", will saying that accomplishment anything meaningful? Probably not. It's not useful advice. It doesn't give any information that could help. All it does is make him feel worse, possibly tilt, and be less likely to want to cooperate with you. Therefore, keep it to yourself or vent elsewhere (say it outloud, to a friend, etc but NOT in chat). What about saying things to encourage your teammates like "nice gank" or providing useful information such as "Ahri no f or ult". The former can increase your team's willingness to work with you on plays or strategies, and the latter is useful information that they can take into account in deciding what to do next. Bad play happened? No point in dwelling on it or arguing over what can't be changed. Instead, try to suggest courses of action that can help come back from it. Rather than saying "you fucked up Y", try saying "no worries, let's try X instead"
It might be kind of hard in the beginning, but it definitely becomes easier over time, and it can help you personally have a better experience by focusing on the positive sides of things on top of reforming.
Hope this helps.
