Wondering how high you can take the PIV in the trial... Maybe 90-92k or so?
Well, sxh's 177m (currently second place at Royalflare) gains an additional ~3000 PIV by saving the bomb I used in late stage 2 for use on Sekibanki's nonspell, so that's one improvement. I wasn't that consistent at getting both x2.0 collections (those life parts are important for suicides) myself without bombing.
A PIV run would also spend the remaining bombs on Kagerou (her 2nd spell seems promising), rather than staying at 4 power and capturing everything.
Edit: I think the inconsistency on stage 2 was on Normal, not Easy. I tried not bombing, and succeeded in getting both x2.0s 6/6 or so times.
Easy - SakuyaB
Karisa - 187,494,690 - C - 0.0% - ReplayEasy - SakuyaB
Karisa - 192,519,430 - C - 0.0% - ReplayNow with even more Sekibanki bombs, finishing stage 2 with 0/0 and 7 bomb parts. I only had 3 power for Kagerou though, so that should be improvable.
Normal - SakuyaB
Karisa - 228,216,540 - C - 0.0% -
ReplayApplying my latest Easy route to Normal. 2 unintentional deaths, one right after midboss Kagerou (with no bombs remaining, but it let some items drop) and one to boss Kagerou's 2nd nonspell (what?). At least I didn't fail Kagerou's 2nd spell yet again this time. Finished with 110,560 PIV.
Time-stop grazing Sekibanki's 2nd probably gives even more ridiculous PIV increase on higher difficulties with all those lasers around. Someone should try it.