Are you kidding me? The rounded fin leading edge makes 800. - 1000 foot difference?!?
Yes. If you get the form factor, actual weight, and actual CG 99% sim vs. real world, it's quite easy from that point to mess with surface finish (Set for all or mix finish for various components), the parachute CD (adjust to match recorded descent rate, drogue and main), and launch conditions in the launch tab to get within 1% sim vs. real world.
Play around with the actual launch conditions for the day (average wind speed and direction) in the launch tab, then plot/export a sim flight and choose GROUND TRACK, and you can sim to your heart's desire current or different conditions and have a reasonable idea of where your rocket will land, too.
That methodology has been used more than a few times to help folks find rockets, especially L3 birds that achieve near-waiver altitudes, that have an uncommanded main at apogee and drift for miles!
I didn’t know sealing the eBay was a Necessity like that. I had over sized holes for passing ejection igniters though and a unused hole from an after thought / change of plans. When loading the payload bay should I be shoving the bundle down ?
Yes, for several reasons. You don't want things like ejection spikes messing with your avionics, specifically the baro sensor. Good chance to blow it out or overstress it and contribute to a failure. Further, BP residue is corrosive, especially to electronics traces on a circuit board. Goes without saying that that's not something you generally want in contact with your avionics.
Lots of folks seal the hardware pass thoughs with neoprene washers or maybe a dab of RTV. Others use a mix of things, and for wire pass throughs or temporary plugs, a hunk of poster putty comes in handy!
When loading the recovery bundle, upper or lower bay, it's good practice to make sure its as far down as it will easily go. ANY shift of weight aft will shift the CG. Uncomanded, uncontrolled during launch is NOT the time for that to happen and it lead to anything good.
It's also good practice in your sim to place the recovery bundles as far aft in the rocket sim as any aft bulkhead will allow when doing build CG estimates, since that's most likely where they'll end up under thrust anyway. Gives you a 'worst case' scenario of CG when in the planning/build phase of a rocket, and thus the greatest margin for safety because you have more accurate information.