Well it's easy to tell whether you'd benefit or not. Just touch a jumper wire from fuse #1 to fuse #7 with the high beams on and if the lights get noticeably brighter then you do. And it really is easy. You'll have it roughed in and working in about 15 minutes, seriously. Done and cleaned up in less than an hour. Relays, wire, and butt crimp connectors will total less than $25. And you won't have to worry about that crappy Lucas toggle switch overheating either (although Bob's parts are generally pretty good). Here's a link to the relays off of Amazon. They're rated for 30 amps, I have a 20 amp fuse in each, and they're running at 10 amps.
https://www.amazon.com/gp/product/B01NBAO1SA