Again as a Jew I really appreciate where you are coming from. But arguments to support Moses might need to be approached differently to be effective and, most importantly honest.
For instance, as a Jewish man I can clearly attest that we are not all convinced that Moses literally wrote the words one reads in the Torah. The only thing we know about Torah authorship is that Moses is responsible for what is written therein or played a major part in our receiving Torah. Maybe he did write every single word you read there, but there is a lot of evidence to argue against it. Regardless of what Moses literally wrote with his hand or not, you won't find many Jews describing the type of inspiration process as you will find supported by Fundamentalist Christianity.
So the argument that 'Moses wrote things but Jesus didn't', except for sounding good at first blush, is not efficacious. Neither is the 'number of Jews' argument much good as there is nothing in Torah which states that the more Jews that follow a prophet the more truthful he is. Often we Jews ignored our prophets, even persecuting the ones that told us truths we didn't want to hear.
However this does not mean you are on the wrong track. The basic premise is good, especially if you are a Jew trying to defend your stand as to why you don't personally accept that Jesus is the promised Prophet like Moses.
To do that effectively and honestly you need to concentrate not on arguments that those exposed to Christianity use, but find the views that shape Jewish thought on the matter. My reason for offering counter arguments as a Jew on your points is to illustrate the it is not effective to approach this argument without learning the Jewish stance.
There are significant reasons Jesus is not accepted by Jews as the so-called "Greater Moses." Some are:
1. Jews don't see a promise in Scripture for a "Great Moses." The "prophet" following him is viewed as Joshua and all prophets to Israel that followed.
2. The Messiah concept is not centrally important to Judaism and as such not definitively formed enough to make such a comparison as you present important. In Judaism it is good to debate, but a diatribe for diatribe sake can be a waste of effort better spent living out Torah than arguing it.
3. The Messiah is not supposed to be greater than or a replacement for Moses in Jewish thought, so making a comparison like this doesn't prove or disprove anything from a Jewish view. The issue itself is superfluous in Judaism, so when you have to discuss it you need to show that the final conclusion either way effects very little in Jewish thought.
4. Claiming Moses was greater by what he supposedly wrote, how many Jews he influenced, how long his teachings have been around, etc., is the wrong approach. Moses is great because he received the Torah. Thus the Torah makes him great, not the other way around.
5. Jesus brought Torah to the Gentiles, or so his ministry is seen by many Jews. As such many Jews today, as the Rabbinical Statement on Christianity explains, view what Jesus did as part of God's plan to reach the world. Jews don't see Jesus or his ministry as an accident. Making such a comparison as you are doing therefore would be like comparing Moses to Isaiah, thus making Isaiah look as if he was unnecessary compared to Moses. This is not a right way to look at things in Judaism. One looks at what one accomplishes in line with their particular purpose from Heaven, and as such Jesus' role shouldn't be diminished just because Jesus was not Moses.