If you stay with 100mg/ml your standard 2%ba/20%bb in gso will hold just fine. I've heard people going to 125mg and it still holds. Anything stronger your going to need eo or guaiacol
Ethyl Oleate, it's a carrier used for hard to suspend short esters and high concentration gear. More eo the higher concentration you can get. So as a percentage of carrier say 70% gso/30% eo may hold 150mg/ml npp where 100% eo may hold 200mg/ml. Eo does slow down absorption which for many reduces pip, but others have a bad reaction to it and cannot use it.