I never had any issue with my testes swelling after injections more than just by the added volume of alcohol. After injecting about
in 7 months, I switched to Everclear and did at least one 1 1/2 ml injection daily (a few days had two injections) for 3 weeks straight. So more frequent injection may be possible after some time. But each is different so listen to your body.
Its been almost exactly 2 years since my last injection and things are doing great. I wish you all well in your quest. It worked for me.