That was the easiest round yet.
In regards to reworking your schedule, I think the schedule you have right now is too generous with what it promises as far as new characters go. I wouldn't expect every relationship with the girls to develop at the same quick pace. So if you want to slow down the story or character development of a newly introduced character then why not add new sex options to a previously introduced character instead?
For example, say you bring in Kat next but you want to write her as a tougher nut to crack as far as romancing her goes. You could add an alternate sex scene for Kim or Trin on a different branch instead of rushing to Kat's and retroactively add the versatility you want while building Kat's story.
It would slow down the rate that you're adding new Rangers but benefit the story by allowing some teasing and slow burn while also not welching on the promised sex scenes in every other release. It will also result in a much larger wealth of content for each Ranger already introduced rather than a one and done.
Ultimately it's up to you, but I'd go the route of quality over quantity.
It's not like there's an end deadline set in stone for the whole project is there? You can take as long as you want to take I guess. With the number of characters in the bank for you to utilise I wasn't expecting this to be a quick ride to the finish line anyway. I mean
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lists something like 41 main female Rangers, that's 41 not including evil Rangers or the likes of Udona. At your current rate, if you wanted to include 41 Rangers, we're looking at a 6 to 7-year project more or less. With other characters, you could end up with a decade-long project if you wanted to so I would stress that you should do whatever you can do to keep the passion for the project alive for you.
If you're churning out stuff you're not happy with then you probably won't want to work on it for the next couple of years let alone a decade.
By the way, that length of time may be daunting but it is based on the current pace, you may speed up as you get more practice under your belt. Heck, maybe you'll draw in that big crowd and it could become your fulltime job and that would speed things up a little too? And maybe you'll be able to bring on help? Don't let my numbers put you off haha, I'm just saying it was never going to be a short project so you may as well take your time with it.