Energy Regen Math for "poor student"

I’ve red several topics, including http://www.grimdawn.com/forums/showthread.php?t=15299 , http://www.grimdawn.com/forums/showthread.php?t=20263.
Still can’t figure it out.

My char:
screen

spirit 58+3
bonus energy regen 15,2%+ 0,11
energy regeneration 6.61

fresh character, no advanced skills, items

How the hell is that calculated, pls explain it to me from a to z, I’ve already spent a lot of time and still missing some values. I don’t know if topic are out of date or should I return to elementary school, I’d be much appreciated if someone give a hand.

Base energy regen at level 1 6.50. You are getting another 0.11 from Spirit, and thus you have 6.61.

Ok, so when I have item/skill with +3,4 energy regen it’s apllied to this base 6.5 value? so it would be 6.5 + 3,4 = 9.9?

And what if I have skill/item with 20% energy regen? It’d be applied to the any value beyond base 6.5 ? i.e 6.5+ (3.4* 1.20)= 6.5 + 4.08(rounded down to 4)= 10.5?

Just wondering if it still works as below, or maybe items also changes regarding to the energy regen and there are no more affixes like this and/or don’t work like this anymore? :

Flat bonuses. These give the listed amount of energy regen, and are very important as without them your percent bonuses mean nothing. You may notice that your Ornate Robe, which is supposed to give you +4.4 Energy Regen is giving you noticeably more. This is due to your Spirit and percent bonuses, and will be discussed shortly.
Percent bonuses. These bonuses boost only your Flat Bonuses by the listed amount. They have no effect on your Base Energy Regen. This means that if your don’t have any Flat Bonusesto your Energy Regen, like that Ornate Robe, you won’t see any benefit from percent bonuses.
Spirit flat bonus. This works by boosting your Base Energy regen as noted above. Again it adds Spirit/100 to your Base Energy Regen, and includes all bonuses to Spirit.
Spirit percent bonus. This is a Percent Bonus equal to spirit/400. (200 spirit will add 50% to the total flat bonuses to energy regen.) Like the Spirit flat bonus, the Spirit percent bonus is based off your total Spirit.