Another data point
I started my Phase I testing without intersection fairings (or any other gear fairings) and had a nice stall, nothing alarming.
After I put the gear fairings and intersection fairings on, I found a very strange sound more than feel just at stall. I don't get any tail shake, but a funny whooshing sound and slight vibration in the side of the fuselage that I believe is the vortex forming at the gear junction and running by the side of the cockpit.
I know this is odd - the reverse of common experience. Also, my stall speed seems high, but I have not thoroughly chased out any possible leaks in the static system. The instrument reads 3 kts high at 55 kt, and my "indicated" stall speed with flaps UP is 61 kts.
So, I don't know if I hit some magic shape with my intersection fairings that does this -- they look about like everyone else's. I've been thinking about adding the strakes.
"The Magic Carpet"
Hobbs 525 in 9 years (would have flown more this year if not for fire smoke)
also LS-6-15/18 sailplane
VAF donation Jan 2019