Thats gonna be real bad. Any chance you have access to basic lab equipment? If so, you could remove some of the BA by gentle heating under vacuum. The boiling point of ba is 205 degrees centigrade, so that might be a higher temp than you would want to subject your tren to if you can do it under vacuum. The vacuum you could pull from a decent water aspirator with cold water (around 15 to 25 torr) would be enough with some gentle heat.
Most people probably don't have access to this kind of equipment, so the next best thing would be to get some more tren, and make a bigger batch, and adjust it to the correct ba/bb ratios. Since this is already a rather large batch, this might be rather costly.
Or just add a bunch more grapeseed oil and make a rather dilute solution of tren. But without adding more tren powder, it is going to be a very dilute solution for your purposes, since 5% ba is probably the highest you would want to go.
If you add another 45g tren powder, and make it a 75mg/mL solution by addition of only grapeseed oil, and no additional ba, then you'll be getting near to a useable product.