Hey
I think DTM would definitely be of benefit. Alot of stripping, cross fiber frictions & stretching would help lengthen and release the tissue.
PNF Stretching and also Myofascial release techniques could also help however these things can only be done with a therapist and not alone.
Also the application of heat can also help as it can increase the elasticity of the tissue, heat followed by alot of stretching would work well.
Goodluck.