Do you think this is too much to soon
I"m not going to answer this question directly because I'm sure other people will do that. I'm going to answer the question abstractly.
There is a point at which the efficiency of training slows down. You can think of a learning curve as having 4 phases.
1) unaware, incompetent (you don't know anything)
2) aware, incompetent (you have gained knowledge but not skills)
3) aware, competent (you have knowledge and your skills are sorted)
4) unaware, competent (in terms of knowledge you have probably forgotten more than you know. Skills are instinctive)
The goal of a scuba course is to kick the student from stage 1 to the the start of stage 3.
If you take multiple courses back-to-back then your *knowledge* will reach stage 3 but your skills will lag behind that knowledge at stage 2 or 3.
Example. We hear about the "zero to hero" courses. Someone who is a DM in that context may have all of the knowledge of a DM but the *skills* of a much less experienced diver.
The simple reason for this is because skills take longer to perfect than knowledge. I can understand in less than a week HOW to build a rocket, but without the experience building simple rockets and then more and more complex ones then I'm not going to be able to build a serious rocket a week from now.
Dive instruction has this too. You sometimes hear people say that someone with a given certification "can't dive". That's not LITERALLY true.... everyone with a certification can dive, but those kinds of comments mean that they can't dive at the level of competence that most people associate with the level of certification. People working in the industry have all seen instructors with marginal buoyancy control , DM's who are nervous about taking off their mask and that kind of thing....
So when you ask the question "is it too much too soon" then you need to ask that question in the context of the steps in learning. If you want people to respect your skills as a diver and you want to be able to blindly rely on those skills then you need to have those skills at level 4. In a zero to hero course they will not get beyond level 3 and if your instructors aren't themselves very competent then you may only have your skills at level 2 when you're done.
My advice is to take some time between certifications and "just go diving" because this is what you need in order to build "instinctive" skills. There is literally no other way to do that.
That does slow down the progress but the quality of the result will improve. This is also a game of diminishing returns but between certifications I think anywhere between 20-50 dives is a good idea. Others will other opinions. Dive shops will hate me for saying this.
In my own case I did about 1000 dives between rescue and DM and maybe another 500 or so between DM and becoming an instructor (as a DM I became technically trained as well). I'm pretty extreme on the "skills" part of the scale and very demanding of myself. You don't need to do that to become a good instructor and your post isn't talking about this either, but the principle is the same even at the AOW level.....
Take my example as just that, an example. What I hope to get across here isn't a "cook book" but a way of helping you understand it.
R..