Heh, totally forgot about grinding. Doesn't seem fun to me unless you have Purplenum.
The entire game is grinding though. Any ID is decent in VH Forest for this purpose, Purplenum is just significantly better because of its specific Pakupaku drop rate, and if you are grinding through VH anyway and want to make a new team, then you may as well. Forest in general is still one of the best places to earn Team Points in Ultimate.
99% of of my team's points were earned by only two people without specifically farming them, gaining enough to unlock everything important (quests, dressing room, flag), in only a few months or so (and that much, actually, I was able to gain entirely myself), with a large amount of them just in HBRs with Whitill Forest, because there are many 10 point drops there that are very common. I've made a couple hundred today alone, mostly in Ultimate Whitill Forest. HBR helps significantly.
With no multi-mode drop penalty now, it can go even faster. I just don't feel that your 1,700 points is very representative of what is possible given the levels of your characters and join date, and that you are making it seem much more difficult than it is. Of course that number multiplied over a few people adds up very fast.
Full disclosure: I probably play more than average myself.