Introducing Young Boars

[Ebatson330]

Hello I am new to this site so if I'm writing this in the wrong area I apologize... I got a male guinea pig (Mordecai) about 3 months ago and he was probably only 4-6 weeks old at the time. I did PLENTY of research and decided to get him a friend. The friend (rigby) is much smaller than him so I would say about a few weeks old? As I stated, I did SO MUCH research so I know I have done the right steps placing them in neutral territory, giving lots of veggies, not including any hidey houses, etc. they did all the normal things, rumble strutting, nose raising, smelling, marking territory, teeth chattering... Then mounting happened. The younger one was mounting the older one A LOT. And I was surprised because he is much much smaller. They didn't get along so great that day so I decided not to put them in the same cage just yet. The next day I introduced them outside in the grass. Rigby was terrified but Mordecai wasn't. They rumble strutted a little but rigby was so scared so Mordecai was, what it seemed to be, comforting him and they were laying side by side calmly. I still didn't want to put them in the same cage because I feel Mordecai had a little bit of an advantage here because he's been outside multiple times while rigby has never been. So I tried again today in the bath tub. Now, Mordecai was the one mounting. Then sometimes he would back away scared as rigby approached him. Rigby would sniff his butt a lot and Mordecai did not like that and would kind of "snap" at rigby. (No biting, he just looked very angry and quickly jumped toward rigby) I just CANNOT for the life of me figure out who is or even wants to be the more dominant one. I moved them into my room because I was tired of being in the bathroom for an hour. Still not getting along. I washed our their cage entirely and put in new bedding and blankets and new everything. I tried putting them in. It's been 7 hours and they still are not getting along. At all. ---I also should mention they have been living in the same cage divided by a fence so that they could still see each other and smell each other. I'm not sure if this was the cause of the problem I am having or not--- so, did I get unlucky to get two guinea pigs who just flat out don't like each other? Am I doing something wrong? I should mention I had to leave and couldn't pay close attention so I had to put the fence up between them again and as SOON as I finished they both were popcorning. It definitely seems like they just would rather be neighbors than roommates

Additional info: their cage is roughly 4ft by 2ft (121 cm x 60cm)
They have never bitten one another or hurt each other in any way
I have two houses, two food bowls, two water bottles, provide unlimited hay and feed them veggies twice a day and a small amount of fruit ever few days (rigby only like beans cucumbers and apples but Mordecai eats romain lettuce tomatoes cucumbers beans apples strawberries... Pretty much anything!)