So in light of this new development I think it would be wise to remove the double temporary hit point rule. I will be removing it from the rules above.
Thank you for pointing this out Alex319!
Certainly in 3.5 Gestalt characters were more powerful than standard; but most of that extra power was in the form of the versatility afforded by having two sets of class features. They didn't have any extra attacks and they certainly didn't have twice as many HP as standard characters.
What I'm not quite clear on is why you want your 4E gestalt characters to be so much more powerful than standard characters.
The temporary hit points gained by vigor are beneficial per attack already... ie they dont need increased because they already are when you multi-attack him...you are trying to make up for insufficient number of heros... it is possible other sources of temp hit points would work alright increased.
It's probably worth note that this is designed to have 'double effect' characters where the Gestalt rules were never designed to work that way. That probably explains the disparity between some people's expectations and the design goal.
No. In fact I am changing that when I do my next update.Is there any particular reason you chose to have it clearly a secondary class, instead of having the two classes more evenly split/merged?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.