So, after some years I finally played some SI today using this list:

4 Infernal Tutor
4 Summoner's Pact
2 Dark Petition
1 Ill-Gotten Gains

3 Tendrils of Agony
1 Goblin Charbelcher

4 Cruel Bargain
4 Infernal Contract

4 Dark Ritual
4 Cabal Ritual
4 Lotus Petal
4 Chrome Mox
3 Elvish Spirit Guide
4 Land Grant
4 Lion's Eye Diamond
4 Culling the Weak
1 Manamorphose
1 Skyshroud Cutter

1 Odious Trow (I don't have Shaman, and I don't give a f*ck)
1 Wild Cantor
1 Dryad Arbor

1 Bayou

SB:
3 Emtpy the Warrens
3 Pact of Negation
3 Unmask
1 Past in Flames
2 Contagion
(only brought 12 cards/ didn't think about the SB)

I switched from 3 Dark Petition to 2 because of some cluncy goldfish I had and went for the 3rd Tendrils. I think I will try -1 Tendrils and +1 Emtpy main.
Nonetheless, it was only a test group for fun not a torunament today but I had fun playing this pile again. Ah, and I went down to only 3 ESG and included a Cutter who was very nice in goldfish games and proved itself to be worth a slot in my type of approach to Pact SI.

2:1 Affinity
I fizzle after playing Infernal Contract and he has the kill with 2 Plating and a flyer. No boarding here. I manage to go through the turn 1 kill on the play with some Draw 4 spells into Infernal > Tendrils. The third game was rough. He plays Chalice on 1. I play 2 Chrome Mox, Dryad Arbor (played turn1) and Cabal Ritual > Charbelcher turn 2 and turn 3 for lethal activation.

2:0 Grixis Delver
Weird game because he takes mulligan on 4 I believe to find a Force but I have a turn 2 or something like that. I think I brought some EtW cutting the Pacts. The second game was also pretty weird. Apperently, he doesn't have counterspells but a Delver and some cantrips but fails to find a Force. I go for it and find a way to win involving IGG for Dark Ritual, Cabal Ritual and Dark Petition for Tendrils.

Elves 2:0
Well, nothing much to say here. He cast GSZ in the first game and a Shaman in the second I believe. I have the combo two times.

UR OmniTell 1:2
I win because of no FoW with a lethal Belcher activation on turn 2. He then has enough counterspells in game 2 and a fast kill and protection in game 3. I think I brought PoN cutting here and there.

As already said, the SB was not really figured out. Main was solid although I don't know if the first EtW is better than the 3rd ToA. It feels that EtW can be huge game1 if there aren't Pacts involved. It'd be a similar appoach like TES or ANT which like to play EtW from the hand. Still thinking that IGG is better than PiF main because of the easy loop and its colour.

+ big thanks to JPA, Andy, Meffeo and Yoni for a nice afternoon
+ jumping in the pool
+ big, hot burger
+/- SI being better than ANT in test games...