What part of Vesta Cave is giving you problems? I noticed that you don't have a lot of recovery. Maybe try replacing something with Uriel. You can also try looking in to Goemon. Goemon + Horus+ should hit pretty hard. You can also try teaming up with a Freyr. 4x Recovery should be enough. I noticed you don't have a Homura. He's pretty useful too.
As soon as Uriel is on a respectable enough level (and I'm rank 132) I'll put him in place of MVD, he's essentially a better version of MVD anyway, though I didn't really have that option until very recently.
Vesta Cave gives me problems because it forces me to use a shiva friend (goddamn you ifrit and your stupid high defense) and that leaves me rather vulnerable especially because I have to lose Ares's orbchange for it, the RCV is a massive problem yes (my own fault for going F/L on horus, really) but tyrannos's x2 rcv mitigates that enough that I can make do when you take echidna's delay into account, I mean, assuming I don't get completely and utterly orbtrolled several times in a row, which unfortunately seems to happen often enough for it to be a problem.
Are they saying the Descend dungeons would be removed from the rotation and unlocked only after Starlight Sanctuary?
Seems stupid because I can only imagine how long it would have taken for me to beat most of Starlight Sanctuary without Gravity. I'd rather wait a month+ for 100% drop instead of slapping my head over drop rates, also.
For now it's just a rumour floating around, though GungHo has made very stupid decisions in the past, and apparently every "new" normal/technical dungeon is being placed after Starlight Sanctuary/Hill of Iris's Rainbow so people are wary - and rightly so since it would screw a LOT of people over.
Would be a lot more reasonable if they made them unlock after you finish OoH and whatever the technical equivalent is - by then most people should actually have a possibility of beating it, without GungHo expecting them to do starlight sanctuary or hill of iris's rainbow.