First, to the OP: Congratulations on surviving and completing the SS1K.
Now for my two cents on the group riding.
I've completed over 100 Patriot Guard Riders missions, some as short as 5 miles and over 50 miles; through residential areas, small towns, and on SoCal freeways; in pre-dawn drowsiness, bright midday sun and after midnight; in fog, rain, near- frosty temps and 100 degree heat.
I've seen tire-smoking, fish tailing evasive maneuvers; riders side by side (and staggered) who couldn't hold a straight line; a ride captain stroked out and died - and then crashed (fortunately, no other dominoes fell). One octogenarian, on the way to a mission on a freezing December morning, crossed the centerline and hit a car headon.
These fine patriots are not, for the most part, riders of the caliber found in the LD community. But most have decades of riding experience - even if it an v-twins! Rule #1 for PGR is "safety" - ride your own ride and if you are not comfortable in a group, ride at the back.
Am I comfortable on these rides? NOT FOR A SECOND.
Would I do a Cert ride with a group of them. Not a chance!
I really don't enjoy group rides. I'd rather ride 1000 miles solo than 10 miles in a group. For me, PGR rides are... An uncomfortable decision for a larger purpose.
I'm just naturally selfish.
My hat is off to the OP!