Re: PhD students - a Prof near retiring told me that its harder to get PhD students now than he's ever seen in his career. I've also noticed that it's getting spottier - because there are so many different methods of getting funding each with low success rates, you can't just go for one and hope you'll get it. So people put in for many different options - one fellow I know ended up with 4 PhD students all starting together, as all his options worked out that year (and you can't tell a student that they can't actually work with you after all because 3 other people also won funding!) - supervising them is all he did for the next four years, and while he got a bunch of research done, he's been out of the grant funding rounds for a while and now that they're graduated is struggling to get going again.
In my field, one grant submission a year would be the standard if you already had 2-3 grants running. 6 is definitely a lot, but 2-3 a year without any current funding is pretty normal. It's just that I've had so many years without funding they rack up, and I am doing a bit more than average... (Although I now know from sitting on funding panels that really successful people often put in 2-3 a year even with funding - there are some names I see at each meeting!)
I've changed my approach recently, and I hope that helps. When I came back from mat leave I just kept putting in grants, like I had before, but it appears the break in track record really did me in. One really stark one was a grant I submitted right before, and then again right after returning: first submission had some valid critique of the project, but said good things about me (rising trajectory, good track record, etc); second submission praised the project but said bad things about me - basically asking 'what's she done lately?' (had a baby!!) and one even said "I don't think she can do it". And it's not like they didn't know about my career break - it was right there in the application in both my CV and a special section about breaks. That pissed me off, and I kept trying the same thing but as time went on the period of doing nothing has gotten longer and longer and 'mat leave' can't explain it anymore. So now I'm submitting to seed/startup funding type things (although there isn't that many for my career stage) and trying to get preliminary work done to show that I can do things (but that's taking forever with just me at it). I do get everything (that I have control over...) read by a lot of people and respond to critiques - the one I'm about to put in, I'm currently waiting for one more bit of feedback from someone previously on that grant panel.
The other set of grants I do (probably 3/4 - 2/3) are big collaborative ones run by someone else - so not always something I can get feedback on, but usually run by big Profs and stuff who one would think knowswhat they're doing. When something like half a dozen people from the dept are all in on a grant that fails run by a Prof, at least it doesn't seem like 'my fault' :) I also keep hearing things through the grapevine: X didn't get his RC bid; Y didn't get his follow-on from charity Q; Z is about to run out of funding as nothing's come through; where X, Y and Z are Directors of Research and other well-known research big-wigs. So I'm in good company with failure. Not sure that's encouraging though...