To clarify, I was using hypersync at 1/1 full power, not HSS and H-mode. Will try to test again.
"Since both CLxxx work with Hyper sync when flash is set to 1/1 (full power) without H mode enabled, I thought I'd try it without using PW's and only use the CLTx/CLRx. As expected, you get black screen or bars above camera sync speed. However, using only the PW miniTT1 on camera with CL-Tx in bypass hot shoe and only CL-Rx on flash without PW, the mini adjust the timing signal and passes it along to CL-Tx to fire CL-Rx allowing the flash to be used in "Hyper sync" mode only (not HSS) without a PW receiver...only transmitter."