I've used multiple methods. To get maximum contrast out of a VC 54 blue-green cold light, there will be no practical distinction between a 47 blue filter and the denser 47B - you've gone as far as you can go in that respect (I've tested it).
Changing the negative - selenium intensification will gain you maybe half a grade.
Contrast-increase masking - works, but is an advanced skill, typically involving the double negative route.
Duplicating the neg on a high contrast medium - again, a double-negative path. First, you generate an interpositive on a versatile fine-grained film like TMax100 or FP4 and develop normally; then you enlarge (or contact print) that onto Ortho-Litho film, and use a moderately strong developer (I prefer HC-110 1:15 from stock). Arista Ortho Litho if fine, but this category of films is difficult to develop evenly (avoid either print developers like Dektol or intense A&B lith developers). I last used this technique about a month ago, converting a soft 6X9 color negative into a more dramatic black and white one.
In terms of a panchromatic high contrast film, the best of those was Tech Pan. I sold off all my remaining 8x10 sheets a year ago.
