Yup!
At ~90%+, you’ll only really have ~3 or so in you, with full recovery. So at ~70%, dropping off after ~5 sounds more like fitness, or going harder than ~70% hah.
Either way, good stuff @duketheslaya . From the sound of it, you’ve been making progress, so that’s great. You’ve gotten some great advice. In the end, you’re still just scratching the surface on this stuff so, a ton of different things will work. The most important thing is just continue to make sure you’re having fun & experimenting safely. The things you want to avoid are going 100% max effort (keep it just a tad bit lower, also it’s safer to go max on a 20m, or 40m, than a 60m or 100m for example), going near max effort on fatigued legs (when form breaks down due to fatigue, not a great idea to force the speed), doing too much volume @ near max effort etc, and increasing total workloads (per session) too fast. Beyond that, it seems like you’re on the right track. 10x100m isn’t too much if it’s a submax tempo session.
If you’re dropping off after ~5 100’s, you’re either going too fast for those first 5, or your fitness just isn’t there yet, and you have to continue to build it. I imagine it’s a mix of the two. However, if you enjoy hitting that speed/pace on your first 5 100’s etc, then basically do like @JMaier31said, split the work into two: 5 x 100’s @ moderate intensity, rest ~5-10 minutes (staying loose), 5 x 100 @ lower intensity - making sure to maintain pace/form and keep your numbers consistent. So you could do that one session, then something else in another, etc. As long as you stay consistent with this in your routine, you’ll make progress and slowly start to just learn things intrinsically - which is powerful.
Also don’t be afraid of going “slow” on your 100’s. One big mistake people make getting into this stuff, is not learning to relax and float. So, turning a 10x100m @ ~70% into a grind it out 10x100m @ 85% down to 60% fatigued etc. If you want to hit 10x100m and keep all of your numbers consistent, you’re going to need to really focus on staying relaxed in those efforts, just getting off the ground fast and trying to remove all excess tension in the hands/face/neck etc.
So basically, on sessions where you just want to get in all of the work (or the remainder of the work) @ a consistent effort, don’t be afraid to just stay loose and float, even if it means going a bit slower. Sprinters (and runners!) master this.
dno my 2cents. hope that makes sense. typed a bit fast, heading out!
peace!