Should I bi-amp or bridge my amps to feed my speakers

I should have mentioned the tube amps are in stereo they’re  HK citation 2’s. They have both been rebuilt. Also speakers are Virgo's the first series 4 ohm. Soix got it right!!

i have considered a small sub woofer, but haven’t made a move on it. 

The room is 14 x 20. This amp is already louder than I can handle. Once in a while I turn the volume up half way on my pre-amp. Sounds good, but don’t need it that loud. I just want a little more bass. I’ll try bi-amp ing this weekend. According to the manual bridging is straight forward and easy.

I feel like an idiot. I bi-amped my speakers this morning and it’s night and day difference, sound stage is more distinct and the speakers have disappeared.
 

I did use one amp for left and right tweets and mids.

one amp for left and right woofers.

I didn’t bother bridging the amps, because I was real happy with the bi-amp configuration