Grumpy pigeon

So I'm fixing up my honda but I keep having a problem with my headlights dimming and dash lights dimming while accelerating as rpms go up it dims but brightens once I press clutch it's fine while ideling but once I start driving they cslowly grow dimmer and air system in car is effected to i have already replaced battery terminals done a big three bare metal connection replaced alt with 130amp one with 4 guage wire running to positive post in addition to charging wire one done both belts checked battery runs 12.5 off aprox and 14.25 while one I also wire brushed the fuse panel main contacts eld replaced idk what is causing it any ideas would help

also this problem started before any of this work was done everything I've done has helped problem but hasn't solved it wondering if it could be a trans ground or battery crank amps are bad or something