First of all, I would replace the diamond there with an emerald.. Besides that, item valves I think should need a florb of Molten enderpearls and omnidirectional hoppers on its sides, and for the corners, obsidian (Or endstone), and the rapid item valve, same recipe but with a tesseract frame (filled) instead of just a florb.. I think cables are too expensive though. Maybe make the output 16 instead of 8.. But you made them seriously expensive for how little they do..
Now... Im a huge fan of mekanism, so yeah, because of its filtering system there is no way im using SFM for much else than auto crafting, that's why I don't find that much use to cables.. Now, if you replace the ducts in the sfm block for cables, then the cables price is actually good, as you need it for the main block and not just to enlarge it. (Also, im fucking tired of Invar, it's everywhere and it feels like they are shoveling Thermal Expansion through my ass, I know a lot of people love it, I like it, but I don't like how every pack now forces you to use invar as the Joker card for recipes... Please, make recipes with Obsidian ingots or reinforced/enriched alloy for mekanism and Ill love you for eternity (even if you do it with freakin atomic alloy, I seriously need a different mod option for my mental sanity.. Even better if it comes from mekanism).
And as long as you don't force people to use fluxed electrum, heaven will rain gold ingots and butter on your naked body while you shower.. Because those are a hassle, please, make them equivalent to atomic alloy :3
Edit: Forgot to say something about the other blocks xD Redstone emitter and receiver could use a rednet controller, after all they have quite some advanced features

Block gate could use a recipe in which it needs both a block placer and a block breaker from open blocks, a chest and a piece of cable. As for the relay, i would change the normal hopper for an omnidirectional one and a B-space tunning fork from jabba to justify the fact that it is able to remain linked to something
