OK, I've been messing around with this a bit more, testing against various people who aren't up to tournament standard but are at least somewhat familiar with Vintage, and I think the mainboard is basically fine as-is. Sometimes I mull badly but I think that's just the nature of the beast with this style of deck and mana-wise this deck is about as consistent as it's going to get. LED won me a crazy amount of games I would otherwise have lost (often without even cracking it -- just having the extra 0-drop artifact can matter a lot). FOW is definitely necessary with the number of Balustrade Spy combo decks running around; at the moment I'm using them in game 1 and boarding them out in matches where I feel it's safe. I haven't properly tried Sensei's Top yet... same goes for Tezzeret, but with the main issue being getting enough mana I'd be surprised if cutting my basic cantrips for it were viable. (Also, redundant Chrome Moxes and Opals make nice Tinker targets.) I'll update this when I've got time to seriously try them out.
The sideboard is still a little awkward:-
4x Hurkyl's Recall
4x Brain Freeze
4x Leyline of Anticipation (underperformed maindeck, but almost always worth boarding in in games when you know you're going second and essentially a necessity against Workshop decks which know what they're fighting)
Mind's Desire
Voltaic Key
Thirst for Knowledge
All of these have performed well except for Hurkyl's Recall, which only really seems good for either boosting my mana when I already have an abundance of mana artifacts (sometimes needed but not very often) or getting rid of opposing cards that are more annoying than dangerous -- the most threatening artifcts will stop me casting HR in the first place. I think I can run four hate cards (in the slots where FOW is currently maindecked), but not much more than that. How common is Leyline of Sanctity these days? I see four options here:
1) Cut the Recalls for 4x Cyclonic Rift or other bounce effect (I suggest Cyclonic Rift because it can get rid of multiple Leylines with one card if need be) and get rid of the Leyline directly.
2) Cut the Recalls for 4x Lab Maniac and try for some convoluted self-milling with my Storm sideboard plan.
3) Leave the sideboard unchanged and hope to not run into Leyline of Sanctity, since most of the decks I'm facing will need to dedicate 8 or mpore slots to beating Dredge and will hopefully be unable to make room for niche hate. Keep Recall as an option for the situations where it matters.
4) Again ignore the threat of Leyline, but replace the Recalls with Divining Tops -- if they work better than Probes -- and board them in in matchups where having stuff to pitch to Force is not a relevant concern.
Advice?
EDIT: Just realised Tezzeret gets around Leyline. But I doubt I'll be able to get his ultimate off against an opponent who knows it's my only way to win. Most decks will have either have killed me by then, have some form of damage spell in hand or will have creatures on the board to deal a point of damage to Tezzeret and shut me down completely. Bob, in particular. The idea definitely has potential but I think I need to be a bit more careful than reducing the number of mana sources.
