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I'm not sure if im using the right terminology here but basically, i want to write a satirical homebrew Chapter where they have fully functional geneseed and a fully functional full set of implanted organs.... but the implanted organs just don't function 'as well as they used to'.

So this Chapter has no problems implanting new recruits and all the implanted organs function as they should (so no missing bletchers gland like in the Imperial Fists or Mucranoid like in the Raven Guard) ... but just not as well as in other Chapters (for example, this hypothetical marine's bletchers gland might produce acid that 'is a bit weaker than standard', their Preomnor might 'not be as digestable', their Occulobe, multi-lung, lyman ears 'aren't quite as good' when compared to say.... a Dark Angels or Ultramarines.)

Is there a precedent for this? or is this set of circumstances even possible?

Would I have to make this hypothetical Chapter a 21st Cursed Founding one to legitimately justfiy it?

Well, strictly speaking that’s any pre-Primaris era Space Marine.

Due to genetic drift and a lesser understanding of the conversion process, a modern Firstborn Astartes is closer to an Inductii, than a full “they took their time and their Geneseed came directly from their Primarch’s cell culture” Astartes Legionnaire.

The end result is still a being vastly superior to a baseline human in pretty much every way. But not quite as hard as the originals.

 Mad Doc Grotsnik wrote:
Well, strictly speaking that’s any pre-Primaris era Space Marine.

Due to genetic drift and a lesser understanding of the conversion process, a modern Firstborn Astartes is closer to an Inductii, than a full “they took their time and their Geneseed came directly from their Primarch’s cell culture” Astartes Legionnaire.

The end result is still a being vastly superior to a baseline human in pretty much every way. But not quite as hard as the originals.

I was hopefully looking for a precedent for a even more watered-down version of a modern Firstborn, just one that had fully functional organs as opposed to a modern Firstborn with missing/non-functional organs

I can't think of any chapter that is described as having organs that are just a little bit gak. However, as Mad Doc Grotsnik has mentioned, there is clear precedent that the purity of the gene seed (and presumably the effectiveness of the implants) has deteriorated over the millennia. A chapter that for whatever reason has suffered more degradation than usual, or simply not been refreshed with pure samples for whatever reasons, is very plausible indeed.

Precedent is a no as far as my knowledge goes, but given how we have the likes of the Blood Angels and Black Dragons, less than effective Astartes organs could certainly happen.

The main issue you need to overcome is how this Chapter has even survived if every single Astartes is less combat effective than their kin.

 Gert wrote:
Precedent is a no as far as my knowledge goes, but given how we have the likes of the Blood Angels and Black Dragons, less than effective Astartes organs could certainly happen.

The main issue you need to overcome is how this Chapter has even survived if every single Astartes is less combat effective than their kin.

Luck.
Not "Every member is lucky in combat," but "They've been lucky enough to avoid any actually dangerous missions requiring their whole Chapter thus far."

Even a crappy Marine Chapter can put down a PDF rebellion without TOO much trouble.

 JNAProductions wrote:

 Gert wrote:
Precedent is a no as far as my knowledge goes, but given how we have the likes of the Blood Angels and Black Dragons, less than effective Astartes organs could certainly happen.

The main issue you need to overcome is how this Chapter has even survived if every single Astartes is less combat effective than their kin.

Luck.
Not "Every member is lucky in combat," but "They've been lucky enough to avoid any actually dangerous missions requiring their whole Chapter thus far."

Even a crappy Marine Chapter can put down a PDF rebellion without TOO much trouble.

My notes has this Chapter not having any particular issues with implantation rejection (ie, most of their recruits don't die on the surgery slab from catastrophic genetic malfunction) as well as being stationed out in a vast backwater where there's nothing more 'dangerous' than 'pirates'.