Raise temps to around 80 (slowly) and add the salt, use medication as a last resort b/c the rams can be super sensitive to them.
actually for the best temp for blue rams your suggestion would be lowering the temp.
the GBR(Ramirezi) is actually more comfortable in warmer waters..very similar to Discus. I consider 82 the low end and as high as 86(which in itself is inhospitible for ich).
raise temp and slowly bump the salt is a good bet.