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1- as long as your temps are good, so your fans aren't running more often, should be good. I've never experienced any down side from the grill block, the only down side I can think of is if I should happen to knock off the air dam I would need to remove the grill block almost immediately
2- while the angle the air is coming in at might make it less of an issue, that same angle is funneling more air there, so I think it would work out the be a wash
3- it looked like my grill block was kinda a disappointment, looked like it was only worth about 1-2%. I didn't do a splitter, but I added an airdam near the front edge of the bumper, serves as front tire spats also, and has a large gap at the center for cooling, it was worth about 2-2.5%
the springs worked well for hitting something forward. if you parked over something when you back up, instead of just hearing a scrape, it was nice and quiet, because the springs stretched until the air dam flopped back under the car. Only trouble was, the springs stayed stretched, and then you had a floppy airdam
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