I hate these splitters, I had nothing but problems with them, having equal length matching cables helped when I had a similar problem as you, but I needed to have 20 feet coiled up behind my theater rack...
Theater- Emotiva UMC1 pro, ERC2, XPA5 amp, Ascend 340se frnts & cntr, 200se srds, HSU VTF2, PS3, LG 55" LED, & Harmony remote
Whole house system UPA200 amp, vol. controls, d-box, 6 zones- Yamaha speakers
Front parlor-2.2 system- XDA1 dac, XPA2 amp, Pure i20 dock, 2 sw300 subs, WD EVO2-40's
Lwr parlor-2.2 system- Wharfedale Jade 5's, 2 sw300 subs, XPA2
GYM- EVO2-8's, carver monoblox, wd sub
bedrm- Jolida 202 tube amp, tekton lores,D1 DAC
PC-Emo MiniX,CBM170's,12" Sub,D1 DAC