Constructive Criticism on my Sens Deck

Hey guys! People have been immensely helpful here in helping me to understand and get into EDH. I started playing magic again a few weeks ago for the first time in years, and me and my roommates have been having a blast! I've been spending a bit too much money on precons and packs to build up my collection, but I think I'm at a point where I can start buying singles - This Sens deck is the fruit of that realization.

This deck is inspired by the Professor and his amazing video on the Triplets, and by people here on r/EDH who helped me come up with options to cover the weaknesses I perceived! Plus, I've thrown in some more cards for flavor and made some of the deck with cards I already have.

I have a lot of questions on what to fix and how, but most are outlined in the description on Tappedout.

My main concern is lands - this is a super heavy deck, and I feel like mana will be an issue until I get my many mana rocks out and ready to go. I have a few questions on this front:

Do I have enough land? If not, why? What dual lands/other lands should I run apart from basics?

In general though, any CC is highly appreciated. Thanks a ton!

deck link here: http://tappedout.net/mtg-decks/sen-commander-v2/