Great experiment. If you're willing, i'd like to see it over more trials, but I can certainly understand your not wanting to do that.

The optimal strategy against this would be as follows (this was done using computer approximated equities against random hands, so the borderline hands could be off, but this is pretty damn close to optimal)

Shorty (ie, whichever of you is shorter) has 10x BB, call with hands that have 45% equity against random holding:

22+, 97+, T7+, J5+, Q2+, K2+, A2+, 78s, 96s, T5s+, J2s+

Shorty has 9x BB, call with hands that have 40% equity against random holding:

everything in previous list and 67, 86+, 95+, T2+, J2+, 56s, 57s, 84s+, 92s+

Shorty has 8x BB, call with hands that have 35% equity against random holding:

everything in previous list and 45, 64+, 74+, 82+, EVERY suited hand except 23s.

Shorty has 7x BB, call with hands that have 30% equity against random holding:

any two

Hope this helps.