You may want to think about switching from your 8 way splitter to a green labeled 4-way splitter instead.
Also, just to make sure, you said you have an HR34, an HR24, and another receiver. What is the third receiver? Hopefully just an HD receiver like an H21/H22/H23, and not another HD-DVR. If it's another HD-DVR you have too many tuners and will need upgraded to a SWM16 setup.
When I had a service call about a year ago to have my dish peaked, the service tech offered to upgrade my non-supported multi-room system to a SWM and DECA system at no cost to me. At that time, I had no idea that only some splitters were to be used in mult-room systems. Since that time, I've noticed, on a number of occasions, people refer to the green label splitters, and, when I checked my equipment, I saw that I do not have a green label splitter. The model number printed on my splitter is MSFSPLIT8R1-02.
I have, during the year I've had this set up, had no issues whatever. Signal levels average about 97 on the Ku transponders and 95 on the Ka transponders, and multi-room viewing seems to work fine. Thus, my question is this. What is it that the green label splitter would do (better) than the splitter that I have? Considering that my system seems to be working fine and that, had I not read anything on this board, I would not have even known that I don't have the right splitter, my inclination would be to leave things the way they are, but, if there are any potential issues with using the wrong splitter, it certainly would be easy enough for me to replace the splitter.