Beau,

I have a lot of experience with small ponds at similar latitudes and also probably the only one here with direct experience with GG's.

Based on my experience, I offer you the following thoughts...

250 HSB in a 1/4 acre pond in the south is way too many. That is a stocking rate of 1000 per acre. The only person I have ever seen recommend such a rate is Todd Overton who has said on here that 1000 pounds of HSB per acre is easy to maintain in small south Texas ponds. My experience is completely contrary to that.

I stocked 200 GG's in a 1/4 acre pond along with 40 HSB about 18 months ago...see my web site for pictures and data collected during those 18 months.

If I had it to do over again, I would stock 250 GG's in the 1/4 acre and stock 25 F1 LMB concurrently. HSB failed to do an adequate job as the predator for me plus they quickly became hook shy. They have a relatively small mouth and prefer pellets which may have contributed to failure as the primary predator....but my objectives in that pond were/are probably different than yours.

With LMB as the predator, you will need to remove all the offspring you catch...or accept overpopulated LMB. I have a neighbor down the road from me that has pictures of a 6.5 pound LMB that he caught from one of my 1/4 acre ponds many years ago before I owned this property. That pond was never managed, stocked (?) only with native BG and LMB and it achieved its own balance. It was full of small LMB that were an absolute blast to catch and respectable BG.

You can have a long term fishing hole with little or no management required in a 1/4 acre pond if you stock regular BG and LMB...without management, you will probably get a pond like I had when I first bought my property over 30 years ago.... a pond full of eager to eat small LMB( could catch 30 or 40 on a fly rod in a fishing session), nice sized native BG, and one or maybe two exceptional LMB who rule the pond roost...and that's not a bad thing, IMO. Good luck.