I don't quite understand the approach. I would rather bet on a 1% HE site if I like the software better, or how they treat me as a customer (the promotions they offer, if they process withdrawals faster and things like that) than on a 0.5% site.
That’s what reputable casinos offer us, a house edge of 1%, along with very satisfying customer service. Some casinos lower their house edge to attract potential gamblers, but if they can’t maintain good support and fast withdrawals, then that slight decrease in house edge can’t outweigh their weaknesses. So, we have to choose wisely.
@OP 1% house edge is probably about the best you are going to find and really all you need IMO.
I don't think he will notice much difference in the sessions between 1% and 0.5%. In the long term he will have that 0.5% more loss but in the short term I doubt very much that the difference will be appreciable. If it was between 10% and 1% it would be noticeable.
The fact that he is looking for a lower house edge, that means he believe that his chances of winning would increase.